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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 | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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) | $ 412 | $ (243) | $ 277 | $ (290)
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 | 2 | 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) | 411 | (243) | 275 | (290)
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) | 218 | (210) | 138 | (247)
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) | $ 218 | $ (210) | $ 138 | $ (247)

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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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