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Financial Instruments - Derivative Instruments Fair Value and Measurement Inputs (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative fair value net asset (liability)	$ (599)	$ (646)
Currency exchange contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	2	(11)
Commodity contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	63	(145)
Interest rate contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	(654)	(490)
Net investment hedge contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	(10)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivative [Line Items]
Derivative fair value net asset (liability)	15	(138)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency exchange contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	15	(138)
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Net investment hedge contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	0
Significant Other Observable Inputs (Level 2)
Derivative [Line Items]
Derivative fair value net asset (liability)	(614)	(508)
Significant Other Observable Inputs (Level 2) | Currency exchange contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	2	(11)
Significant Other Observable Inputs (Level 2) | Commodity contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	48	(7)
Significant Other Observable Inputs (Level 2) | Interest rate contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	(654)	(490)
Significant Other Observable Inputs (Level 2) | Net investment hedge contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	(10)
Significant Unobservable Inputs (Level 3)
Derivative [Line Items]
Derivative fair value net asset (liability)	0	0
Significant Unobservable Inputs (Level 3) | Currency exchange contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	0	0
Significant Unobservable Inputs (Level 3) | Commodity contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	0	0
Significant Unobservable Inputs (Level 3) | Interest rate contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	0	$ 0
Significant Unobservable Inputs (Level 3) | Net investment hedge contracts
Derivative [Line Items]
Derivative fair value net asset (liability)	$ 0

X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

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- Definition

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+ References

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