Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 5)

v2.4.1.9
PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
U.S. Plans      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year     $ 2,327us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Fair value of plan assets at end of year 2,713us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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2,445us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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2,327us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
U.S. Plans | Significant unobservable inputs (Level 3)      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year 296us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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286us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Unrealized (losses) gains on assets still held at the reporting date 33us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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30us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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Purchases, sales and settlements, net (23)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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(20)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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Fair value of plan assets at end of year 306us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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296us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Plans | Significant unobservable inputs (Level 3) | Private equity      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year 153us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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156us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Unrealized (losses) gains on assets still held at the reporting date 22us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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20us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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Purchases, sales and settlements, net (27)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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(23)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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Fair value of plan assets at end of year 148us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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153us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Plans | Significant unobservable inputs (Level 3) | Real estate      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year 143us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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130us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Unrealized (losses) gains on assets still held at the reporting date 11us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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10us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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Purchases, sales and settlements, net 4us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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3us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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Fair value of plan assets at end of year 158us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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143us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Non-U.S. Plans      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year     1,324us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Fair value of plan assets at end of year 1,724us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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1,516us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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1,324us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_ForeignPensionPlansDefinedBenefitMember
Non-U.S. Plans | Significant unobservable inputs (Level 3)      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year 557us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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486us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Unrealized (losses) gains on assets still held at the reporting date 50us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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36us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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Purchases, sales and settlements, net (3)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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35us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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Fair value of plan assets at end of year 604us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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557us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Non-U.S. Plans | Significant unobservable inputs (Level 3) | Private equity      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year 48us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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28us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Unrealized (losses) gains on assets still held at the reporting date 11us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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5us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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Purchases, sales and settlements, net 22us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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15us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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Fair value of plan assets at end of year 81us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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48us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Non-U.S. Plans | Significant unobservable inputs (Level 3) | Real estate      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year 69us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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34us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Unrealized (losses) gains on assets still held at the reporting date (3)us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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2us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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Purchases, sales and settlements, net (5)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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33us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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Fair value of plan assets at end of year 61us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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69us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Non-U.S. Plans | Significant unobservable inputs (Level 3) | Insurance      
Summary of changes in the fair value of level 3 assets      
Fair value of plan assets at beginning of year 440us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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424us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Unrealized (losses) gains on assets still held at the reporting date 42us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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29us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld
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Purchases, sales and settlements, net (20)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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(13)us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements
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Fair value of plan assets at end of year $ 462us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 440us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= cmi_InsuranceMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member