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Effects of Cash Flow Hedges (Detail) - Cash Flow Hedges - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains / (losses) reclassified from AOCI into earnings | $ 13 | $ 2 | $ 10 | $ (64)
Gains / (losses) recognized in OCI | (6) | 4 | 21 | (53)
Currency exchange contracts | Forecasted transactions |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains / (losses) reclassified from AOCI into earnings | (3) | (6) | (2) | (3)
Gains / (losses) recognized in OCI | (11) | (11) | (37) | (21)
Commodity contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains / (losses) reclassified from AOCI into earnings | 16 | 8 | 12 | (1)
Gains / (losses) recognized in OCI | 25 | 10 | 31 | 19
Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains / (losses) reclassified from AOCI into earnings |  |  |  | (60)
Gains / (losses) recognized in OCI | $ (20) | $ 5 | $ 27 | $ (51)

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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 + Details
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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 + Details
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