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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - Cash Flow Hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	$ 14	$ (7)
Gains/(losses), net of taxes recognized in earnings/(losses)	(32)	11
Currency exchange contracts | Forecasted transactions
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses), net of taxes recognized in earnings/(losses)	0	(6)
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	0	(7)
Gains/(losses), net of taxes recognized in earnings/(losses)	0	(1)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	14	0
Gains/(losses), net of taxes recognized in earnings/(losses)	$ (32)	$ 18

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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