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Derivative Financial Instruments - Gains and Losses on Derivative Instruments Designated and Qualifying As Hedging Instruments in Cash Flow Hedges (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 49 $ (25) $ 16 $ (60)
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) (2) (2) (5) (3)
Gain (Loss) Recognized in Income on the Derivative (Ineffective Portion) 0 0 0 0
Foreign exchange contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 1 0 1 1
Foreign exchange contracts [Member] | Interest Income (Expense), Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 0 0 0 0
Foreign exchange contracts [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on the Derivative (Ineffective Portion) 0 0 0 0
Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) 48 (25) 15 (61)
Interest rate contracts [Member] | Interest Income (Expense), Net [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) (2) (2) (5) (3)
Interest rate contracts [Member] | Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on the Derivative (Ineffective Portion) $ 0 $ 0 $ 0 $ 0