Quarterly report pursuant to Section 13 or 15(d)

OPERATING SEGMENTS (Details)

v2.4.1.9
OPERATING SEGMENTS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Operating results:    
Total sales $ 4,709us-gaap_SalesRevenueNet [1] $ 4,406us-gaap_SalesRevenueNet [1]
Depreciation and amortization 127cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount [2] 105cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
Research, development and engineering expenses 195us-gaap_ResearchAndDevelopmentExpense 190us-gaap_ResearchAndDevelopmentExpense
Equity, royalty and interest income from investees 68cmi_EquityRoyaltyAndInterestIncomeFromInvestees 90cmi_EquityRoyaltyAndInterestIncomeFromInvestees
Interest income 5us-gaap_InvestmentIncomeInterest 5us-gaap_InvestmentIncomeInterest
Segment EBIT 562cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes 528cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
Less: Interest expense 14us-gaap_InterestExpense 17us-gaap_InterestExpense
INCOME BEFORE INCOME TAXES 548us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 511us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Gain on remeasurement of pre-existing ownership interest in the acquiree company   6us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Amortization of debt discount and deferred costs excluded 1cmi_SegmentExclusionsForDepreAndAmort  
Minimum [Member]    
Operating results:    
Amortization of debt discount and deferred costs excluded   0cmi_SegmentExclusionsForDepreAndAmort
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Engine    
Operating results:    
Depreciation and amortization 58cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		[2] 51cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		[2]
Research, development and engineering expenses 114us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		116us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember
Equity, royalty and interest income from investees 30cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		32cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember
Interest income 2us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		2us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember
Segment EBIT 253cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		269cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember
Distribution    
Operating results:    
Depreciation and amortization 27cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		[2] 16cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		[2]
Research, development and engineering expenses 3us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		2us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember
Equity, royalty and interest income from investees 20cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		41cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember
Interest income 1us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		1us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember
Segment EBIT 88cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		[3] 76cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		[3]
Components [Member]    
Operating results:    
Depreciation and amortization 26cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		[2] 26cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		[2]
Research, development and engineering expenses 61us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		53us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember
Equity, royalty and interest income from investees 9cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		9cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember
Interest income 1us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		1us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember
Segment EBIT 195cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		167cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember
Power Generation    
Operating results:    
Depreciation and amortization 16cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		[2] 12cmi_DepreciationAndAmortizationExcludingAmortizationOfDebtDiscount
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		[2]
Research, development and engineering expenses 17us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		19us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember
Equity, royalty and interest income from investees 9cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		8cmi_EquityRoyaltyAndInterestIncomeFromInvestees
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember
Interest income 1us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		1us-gaap_InvestmentIncomeInterest
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember
Segment EBIT 49cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		25cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember
Non-segment items    
Operating results:    
Segment EBIT (23)cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember 		[4] (9)cmi_SegmentReportingInformationIncomeLossBeforeInterestExpenseAndIncomeTaxes
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember 		[4]
External Sales    
Operating results:    
Total sales 4,709us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember 		4,406us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
External Sales | Engine    
Operating results:    
Total sales 1,889us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		2,090us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember
External Sales | Distribution    
Operating results:    
Total sales 1,469us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		942us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember
External Sales | Components [Member]    
Operating results:    
Total sales 931us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		922us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember
External Sales | Power Generation    
Operating results:    
Total sales 420us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		452us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= cmi_ExternalSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember
Intersegment sales | Engine    
Operating results:    
Total sales 707us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		473us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember
Intersegment sales | Distribution    
Operating results:    
Total sales 7us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		8us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember
Intersegment sales | Components [Member]    
Operating results:    
Total sales 368us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		308us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember
Intersegment sales | Power Generation    
Operating results:    
Total sales 260us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		187us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember
Intersegment sales | Non-segment items    
Operating results:    
Total sales (1,342)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember 		[4] (976)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember 		[4]
Reportable segment    
Operating results:    
Total sales 4,709us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember 		4,406us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Reportable segment | Engine    
Operating results:    
Total sales 2,596us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember 		2,563us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_EngineMember
Reportable segment | Distribution    
Operating results:    
Total sales 1,476us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember 		950us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_DistributionMember
Reportable segment | Components [Member]    
Operating results:    
Total sales 1,299us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember 		1,230us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_ComponentsMember
Reportable segment | Power Generation    
Operating results:    
Total sales 680us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember 		639us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= cmi_PowerGenerationMember
Reportable segment | Non-segment items    
Operating results:    
Total sales $ (1,342)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember 		[4] $ (976)us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember 		[4]
[1] Includes sales to nonconsolidated equity investees of $325 million and $592 million for the three month periods ended March 29, 2015 and March 30, 2014, respectively.
[2] Depreciation and amortization as shown on a segment basis excludes the amortization of debt discount and deferred costs included in the Condensed Consolidated Statements of Income as "Interest expense." The amortization of debt discount and deferred costs were $1 million and less than $1 million for the three months ended March 29, 2015 and March 30, 2014, respectively.
[3] Distribution segment EBIT included a gain of $6 million on the fair value adjustment resulting from the acquisition of a controlling interest in a North American distributor for the three months ended March 30, 2014.
[4] Includes intersegment sales and profit in inventory eliminations and unallocated corporate expenses. There were no significant unallocated corporate expenses for the three months ended March 29, 2015 and March 30, 2014.