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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	$ (27)	$ (53)	$ 0
Gains / (losses) recognized in OCI	(19)	(129)	(43)
Currency exchange contracts | Forecasted transactions
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	(3)	(1)	83
Gains / (losses) recognized in OCI	(38)	8	40
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	(24)	(4)	(52)
Gains / (losses) recognized in OCI	7	(34)	(35)
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gains / (losses) reclassified from AOCI into earnings	0	(48)	(31)
Gains / (losses) recognized in OCI	$ 12	$ (103)	$ (48)

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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
-Subparagraph (b)
-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
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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