Annual report pursuant to Section 13 and 15(d)

DEBT (Details)

v2.4.1.9
DEBT (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Sep. 19, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 09, 2012
Feb. 28, 2014
Nov. 30, 2005
Debt Instruments              
Loans payable   $ 86,000,000us-gaap_ShortTermBorrowings $ 17,000,000us-gaap_ShortTermBorrowings        
Unamortized discount   (47,000,000)us-gaap_DebtInstrumentUnamortizedDiscount (48,000,000)us-gaap_DebtInstrumentUnamortizedDiscount        
Fair value adjustment due to hedge on indebtedness   65,000,000us-gaap_DeferredGainLossOnDiscontinuationOfFairValueHedge 49,000,000us-gaap_DeferredGainLossOnDiscontinuationOfFairValueHedge        
Capital leases   87,000,000us-gaap_CapitalLeaseObligationsNoncurrent 92,000,000us-gaap_CapitalLeaseObligationsNoncurrent        
Total long-term debt   1,612,000,000us-gaap_DebtAndCapitalLeaseObligations 1,723,000,000us-gaap_DebtAndCapitalLeaseObligations        
Less: Current maturities of long-term debt   (23,000,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (51,000,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent        
Long-term debt   1,589,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 1,672,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations        
Debt Instrument Face Amount, upon issuance 1,000,000,000us-gaap_DebtInstrumentFaceAmount            
Proceeds from borrowings 979,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 55,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 1,004,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 64,000,000us-gaap_ProceedsFromIssuanceOfLongTermDebt      
Principal payments required on long-term debt              
2015   23,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths          
2016   28,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo          
2017   12,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree          
2018   16,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour          
2019   11,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive          
Fair value              
Fair value of total debt   1,993,000,000us-gaap_LongTermDebtFairValue 1,877,000,000us-gaap_LongTermDebtFairValue        
Carrying value of total debt   1,698,000,000us-gaap_DebtInstrumentCarryingAmount 1,740,000,000us-gaap_DebtInstrumentCarryingAmount        
Loans payable              
Debt Instruments              
Weighted average interest rate (as a percent)   3.70%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		2.59%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		3.21%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		     
Total interest incurred   71,000,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		48,000,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		39,000,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		     
Interest capitalized   7,000,000us-gaap_InterestCostsCapitalized
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		7,000,000us-gaap_InterestCostsCapitalized
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		7,000,000us-gaap_InterestCostsCapitalized
/ us-gaap_DebtInstrumentAxis
= us-gaap_LoansPayableMember 		     
5-year revolving credit agreement              
Debt Instruments              
Term of loan         5 years    
Revolving credit facility amount available for swingline loans         200,000,000us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases
/ us-gaap_DebtInstrumentAxis
= cmi_RevolvingCreditFacilityMaturing9November2017Member 		   
Debt Instrument, Description of Variable Rate Basis   LIBOR          
Percentage added to reference rate to compute the variable interest rate   0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= cmi_RevolvingCreditFacilityMaturing9November2017Member 		         
Leverage ratio   3.25cmi_LeverageRatio
/ us-gaap_DebtInstrumentAxis
= cmi_RevolvingCreditFacilityMaturing9November2017Member 		         
Maximum credit capacity of the revolving credit facility   1,750,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cmi_RevolvingCreditFacilityMaturing9November2017Member 		    1,750,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cmi_RevolvingCreditFacilityMaturing9November2017Member 		   
Less: Letters of credit against revolving credit facility   24,000,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_DebtInstrumentAxis
= cmi_RevolvingCreditFacilityMaturing9November2017Member 		         
Amount available for borrowing under the revolving credit facility   1,726,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cmi_RevolvingCreditFacilityMaturing9November2017Member 		         
International and other domestic short-term credit facilities              
Debt Instruments              
Amount available for borrowing under the revolving credit facility   261,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= cmi_InternationalandOtherDomesticCreditFacilitiesMember 		         
Borrowings against other domestic and international short-term facilities   86,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cmi_InternationalandOtherDomesticCreditFacilitiesMember 		17,000,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= cmi_InternationalandOtherDomesticCreditFacilitiesMember 		       
Senior Notes, 3.65%, due 2023              
Debt Instruments              
Long-term debt gross   500,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes3.65PercentDue2023Member 		500,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes3.65PercentDue2023Member 		       
Debt Instrument Face Amount, upon issuance 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes3.65PercentDue2023Member 		           
Debt instrument interest rate (as a percent)   3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes3.65PercentDue2023Member 		         
Debentures, 6.75%, due 2027              
Debt Instruments              
Long-term debt gross   58,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures6.75PercentDue2027Member 		58,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures6.75PercentDue2027Member 		       
Debt instrument interest rate (as a percent)   6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures6.75PercentDue2027Member 		         
Debentures, 7.125%, due 2028              
Debt Instruments              
Long-term debt gross   250,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures7.125PercentDue2028Member 		250,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures7.125PercentDue2028Member 		       
Debt instrument interest rate (as a percent)   7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures7.125PercentDue2028Member 		         
Senior Notes 4.875 Percent, Due 2043              
Debt Instruments              
Long-term debt gross   500,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes4.875PercentDue2043Member 		500,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes4.875PercentDue2043Member 		       
Debt Instrument Face Amount, upon issuance 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes4.875PercentDue2043Member 		           
Debt instrument interest rate (as a percent)   4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes4.875PercentDue2043Member 		         
Debentures, 5.65%, due 2098 (effective interest rate 7.48%)              
Debt Instruments              
Long-term debt gross   165,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures5.65PercentDue2098Member 		165,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures5.65PercentDue2098Member 		       
Debt instrument interest rate (as a percent)   5.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures5.65PercentDue2098Member 		         
Effective interest rate (as a percent)   7.48%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures5.65PercentDue2098Member 		         
Credit Facility Related to Consolidated Joint Ventures              
Debt Instruments              
Long-term debt gross   3,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_CreditFacilityRelatedToJointVenturesMember 		92,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_CreditFacilityRelatedToJointVenturesMember 		       
Other long-term debt              
Debt Instruments              
Long-term debt gross   31,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_OtherLongTermDebtMember 		65,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cmi_OtherLongTermDebtMember 		       
Interest rate contracts | Senior Notes, 3.65%, due 2023              
Debt Instruments              
Debt Instrument Face Amount, upon issuance 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes3.65PercentDue2023Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember 		           
Fixed rate on debt issue, due in 2023 (as a percent) 3.65%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= cmi_SeniorNotes3.65PercentDue2023Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember 		           
Interest rate contracts | Debentures, 7.125%, due 2028              
Debt Instruments              
Debt Instrument Face Amount, upon issuance             250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures7.125PercentDue2028Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
Other debt disclosure              
Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge           52,000,000us-gaap_DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge
/ us-gaap_DebtInstrumentAxis
= cmi_Debentures7.125PercentDue2028Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember 		 
Amortization Period of Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge           14 years  
London Interbank Offered Rate (LIBOR) [Member] | Interest rate contracts | Senior Notes, 3.65%, due 2023              
Debt Instruments              
Debt Instrument, Description of Variable Rate Basis           one-month LIBOR  
London Interbank Offered Rate (LIBOR) [Member] | Interest rate contracts | Debentures, 7.125%, due 2028              
Debt Instruments              
Debt Instrument, Description of Variable Rate Basis             LIBOR
Interest Expense [Member] | Interest rate contracts              
Debt Instruments              
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments   23,000,000us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember 		[1] (39,000,000)us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember 		[1] 6,000,000us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember 		[1]      
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   $ (19,000,000)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember 		[1] $ 39,000,000us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember 		[1] $ (6,000,000)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember 		[1]      
[1] The difference between the gain/(loss) on swaps and borrowings represents hedge ineffectiveness.