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Amount and Location in the Income Statement for Derivatives Designed as Cash Flow Hedges (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments in Cash Flow Hedging Relationships |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) | $ 58 | $ (141) | $ 335 | $ (431)
Derivative Instruments in Cash Flow Hedging Relationships | Interest rate contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) | 1 | 0 | 3 | 0
Derivative Instruments in Cash Flow Hedging Relationships | Foreign exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) | 57 | (141) | 332 | (431)
Non-derivative Instruments in Net Investment Hedging Relationships |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) | 10 | (142) | 148 | (389)
Non-derivative Instruments in Net Investment Hedging Relationships | Foreign exchange contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) | $ 10 | $ (142) | $ 148 | $ (389)

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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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