Quarterly report pursuant to Section 13 or 15(d)

Amount and Location in the Income Statement for Derivatives Designated as Fair Value Hedges (Detail)

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Amount and Location in the Income Statement for Derivatives Designated as Fair Value Hedges (Detail) - Fair Value Hedging - Interest Expense - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Amount of Gain (Loss) Recognized in Income $ (54) $ (24)
Fixed-Rate Debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged Items Amount of Gain (Loss) Recognized in Income $ 54 $ 24