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 [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Interest Rate Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income $ 95 $ 55
Fixed-Rate Debt and Capital Leases    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income $ (95) $ (55)