Quarterly report pursuant to Section 13 or 15(d)

Amount and Location in the Income Statement for Derivatives Designed as Cash Flow Hedges (Detail)

v3.8.0.1
Amount and Location in the Income Statement for Derivatives Designed as Cash Flow Hedges (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments in Cash Flow Hedging Relationships        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ (141) $ (27) $ (431) $ (39)
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) 0 0 0 (3)
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) (141) (27) (431) (36)
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) (142) (7) (389) (30)
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) $ (142) $ (7) $ (389) $ (30)