ACQUISITIONS AND DIVESTITURES (Details)

v2.4.1.9

ACQUISITIONS AND DIVESTITURES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					0 Months Ended																			12 Months Ended		1 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012		Nov. 03, 2014		Sep. 29, 2014		Aug. 04, 2014		May 05, 2014	Mar. 31, 2014		Feb. 14, 2014		Dec. 31, 2013	May 06, 2013		Jul. 01, 2013	Jan. 31, 2013		Jul. 02, 2012		Dec. 31, 2011		Jul. 31, 2012	Sep. 16, 2013
Business Acquisition
Investments and advances related to equity method investees	$ 981us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	$ 931us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures		$ 897us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures													$ 931us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Gain on remeasurement of pre-existing ownership interest in the acquiree company	73us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	12us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain		7us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Business Combination Purchase Price Distributed in Future Quarters	22cmi_BusinessCombinationPurchasePriceDistributedInFutureQuarters
The purchase price was allocated as follows:
Goodwill	479us-gaap_Goodwill	461us-gaap_Goodwill		445us-gaap_Goodwill													461us-gaap_Goodwill
Net sales, included in consolidated statement	19,221us-gaap_SalesRevenueNet	17,301us-gaap_SalesRevenueNet		17,334us-gaap_SalesRevenueNet	[1]
Cummins Bridgeway LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired						54.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[2]
Cash paid for business acquisition						22us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[2]
Payments to Acquire Businesses Liabilities Paid						45cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[2]
Gain on remeasurement of pre-existing ownership interest in the acquiree company						13us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[2],[3]
Net sales prior to acquisition		331us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[4]
The purchase price was allocated as follows:
Intangible assets, other than goodwill						15us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[2],[5]
Goodwill						4us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[2]
Consideration transferred						77us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsBridgewayLLCMemberDomain	[2],[6]
Cummins Npower LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired								50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember
Cash paid for business acquisition								33us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember
Payments to Acquire Businesses Liabilities Paid								34cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember
Gain on remeasurement of pre-existing ownership interest in the acquiree company								15us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember	[3]
Net sales prior to acquisition		374us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember	[4]
The purchase price was allocated as follows:
Intangible assets, other than goodwill								8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember	[5]
Goodwill								7us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember
Consideration transferred								73us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNpowerLLCMember	[6]
Cummins Power South LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired								50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember
Cash paid for business acquisition								17us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember
Payments to Acquire Businesses Liabilities Paid								16cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember
Gain on remeasurement of pre-existing ownership interest in the acquiree company								7us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember	[3]
Net sales prior to acquisition		239us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember	[4]
The purchase price was allocated as follows:
Intangible assets, other than goodwill								1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember	[5]
Goodwill								8us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember
Consideration transferred								35us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSouthLLCMember	[6]
Cummins Eastern Canada LP
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired										50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember
Cash paid for business acquisition										29us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember
Payments to Acquire Businesses Liabilities Paid										32cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember
Gain on remeasurement of pre-existing ownership interest in the acquiree company										18us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember	[3]
Net sales prior to acquisition		228us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember	[4]
The purchase price was allocated as follows:
Intangible assets, other than goodwill										4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember	[5]
Goodwill										5us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember
Consideration transferred										62us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsEasternCanadaLPMember	[6]
Cummins Power Systems LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired												30.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSystemsLLCMember
Cash paid for business acquisition												14us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSystemsLLCMember
Payments to Acquire Businesses Liabilities Paid												0cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSystemsLLCMember
The purchase price was allocated as follows:
Consideration transferred												14us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsPowerSystemsLLCMember
Cummins Southern Plains LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired													50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Cash paid for business acquisition													43us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Payments to Acquire Businesses Liabilities Paid													48cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Gain on remeasurement of pre-existing ownership interest in the acquiree company													13us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember	[3]
Net sales prior to acquisition		433us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember	[4]
The purchase price was allocated as follows:
Accounts receivable													63us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Inventory													59us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Fixed assets													47us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Intangible assets, other than goodwill													11us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember	[5]
Goodwill													1us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Other assets													8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Current liabilities													(53)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities													0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Total business valuation													136us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Fair value of pre-existing 33 percent interest													(44)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember
Consideration transferred													92us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsSouthernPlainsLLCMember	[6]
Cummins Mid-South LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired															62.20%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Cash paid for business acquisition															55us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Payments to Acquire Businesses Liabilities Paid															61cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Gain on remeasurement of pre-existing ownership interest in the acquiree company															7us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember	[3]
Net sales prior to acquisition		368us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember	[4]
The purchase price was allocated as follows:
Accounts receivable															71us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Inventory															70us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Fixed assets															37us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Intangible assets, other than goodwill															8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember	[5]
Goodwill															4us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Other assets															10us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Current liabilities															(43)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities															(4)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Total business valuation															153us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Fair value of pre-existing 33 percent interest															(35)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember
Consideration transferred															118us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsMidSouthLLCMember	[6]
Cummins Western Canada LP
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired		35.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsWesternCanadaLPMember															35.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsWesternCanadaLPMember
Cash paid for business acquisition																	32us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsWesternCanadaLPMember
Payments to Acquire Businesses Liabilities Paid		0cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsWesternCanadaLPMember															0cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsWesternCanadaLPMember
The purchase price was allocated as follows:
Consideration transferred																	32us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsWesternCanadaLPMember
Cummins Rocky Mountain LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired																		67.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Cash paid for business acquisition																		62us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Payments to Acquire Businesses Liabilities Paid																		74cmi_PaymentsToAcquireBusinessesLiabilitiesPaid / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Gain on remeasurement of pre-existing ownership interest in the acquiree company																		5us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember	[3]
Net sales prior to acquisition				384us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember	[4]
The purchase price was allocated as follows:
Accounts receivable																		48us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Inventory																		100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Fixed assets																		34us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Intangible assets, other than goodwill																		8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember	[5]
Goodwill																		10us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Other assets																		8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Current liabilities																		(41)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities																		0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Total business valuation																		167us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Fair value of pre-existing 33 percent interest																		(31)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Consideration transferred																		136us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsRockyMountainLLCMember
Cummins Northwest LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired																				20.01%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	[7]
Cash paid for business acquisition																				4us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	18us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	[7]
Gain on remeasurement of pre-existing ownership interest in the acquiree company																					7us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	[3],[7]
Net sales prior to acquisition				137us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	[4],[7]
Additional interest acquired (as a percent)																					20.01%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember
Ownership in partnership formed, post acquisition (as a percent)																					79.99%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember
The purchase price was allocated as follows:
Intangible assets, other than goodwill																					2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	[5],[7]
Goodwill																					3us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	[7]
Consideration transferred																				4us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	18us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsNorthwestMember	[7]
Cummins Central Power LLC
Business Acquisition
Business Acquisition, Percentage of Voting Interests Acquired																							45.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = cmi_CumminsCentralPowerMember	[8]
Cash paid for business acquisition																							26us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cmi_CumminsCentralPowerMember
Gain on remeasurement of pre-existing ownership interest in the acquiree company																							7us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = cmi_CumminsCentralPowerMember	[3]
Net sales prior to acquisition																									209us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_CumminsCentralPowerMember	[4]
Ownership in partnership formed, post acquisition (as a percent)																							79.99%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = cmi_CumminsCentralPowerMember
The purchase price was allocated as follows:
Intangible assets, other than goodwill																							4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_CumminsCentralPowerMember	[5]
Consideration transferred																							26us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = cmi_CumminsCentralPowerMember
Hilite Germany GmbH
Business Acquisition
Net sales prior to acquisition				104us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
The purchase price was allocated as follows:
Inventory																											5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Fixed assets																											5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Intangible assets, other than goodwill																											83us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Goodwill																											91us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Liabilities																											(8)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Purchase Price																											176us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Acquisition related costs				4us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Finite-Lived Intangibles																											83us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Weighted average amortization life																											8 years 6 months
Net sales, included in consolidated statement				46us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember
Hilite Germany GmbH | Technology
The purchase price was allocated as follows:
Finite-Lived Intangibles																											52us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = cmi_TechnologyMember
Weighted average amortization life																											10 years 7 months 6 days
Hilite Germany GmbH | Customer
The purchase price was allocated as follows:
Finite-Lived Intangibles																											23us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Weighted average amortization life																											4 years 6 months
Hilite Germany GmbH | License agreements
The purchase price was allocated as follows:
Finite-Lived Intangibles																											$ 8us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = cmi_HiliteGermanyGmbHMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Weighted average amortization life																											6 years
Minimum
Business Acquisition
Acquisition period for North American distributors																												3 years
Maximum
Business Acquisition
Acquisition period for North American distributors																												5 years
Maximum | Customer
The purchase price was allocated as follows:
Weighted average amortization life	5 years
[1] Includes sales to nonconsolidated equity investees of $2,063 million, $2,319 million and $2,427 million for the years ended December 31, 2014, 2013 and 2012, respectively. [2] Purchase accounting for this acquisition is preliminary awaiting customary adjustment to purchase price in accordance with the purchase agreements. [3] All results from acquired entities were included in Distribution segment results subsequent to the acquisition date. Previously consolidated entities were accounted for as equity transactions (EQUITY). Newly consolidated entities were accounted for as business combinations (COMB) with gains recognized based on the requirement to remeasure our pre-existing ownership to fair value in accordance with GAAP and are included in the Consolidated Statements of Income as "Other income (expense), net." [4] Sales amounts are not fully incremental to our consolidated sales as the amount would be reduced by the elimination of sales to the previously unconsolidated entity. [5] Intangible assets acquired in business combinations were mostly customer related, the majority of which will be amortized over a period of up to five years from the date of the acquisition. [6] The "Total Purchase Consideration" represents the total amount that will or is estimated to be paid to complete the acquisition. In some instances a portion of the acquisition payment has not yet been made and will be paid in future periods in accordance with the purchase contract. The total outstanding consideration at December 31, 2014, was $22 million. [7] Prior to our decision to acquire the remaining interest in our North American and Canadian distributors, we acquired the remaining ownership interest in Northwest and immediately formed a new partnership with a new distributor principal and sold 20.01 percent to the new distributor principal. We retained a new ownership in Northwest of 79.99 percent. We subsequently repurchased the remaining outstanding interest under the new contract in July 2013. [8] After the acquisition, Cummins owned a 79.99 percent interest in Central Power.