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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Realized Gain (Loss) on Derivatives, Net $ (3) $ (129)
Unrealized Gain (Loss) on Derivatives 88 716
Total Gain (Loss) On Derivatives, Net (16) 1
Realized Gain (Loss) on Derivatives 6 (74)
Unrealized Gain (Loss) on Hedged Item (101) (586)
Total Gain (Loss) on Derivatives, Gross (7) 56
Trading [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives 54 98
Realized Gain (Loss) on Derivatives (3) (129)
Unrealized Gain (Loss) on Derivatives, Net 88 716
Total Gain (Loss) on Derivatives, Gross 51 (31)
Trading [Member] | Interest Rate Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives (7) 53
Realized Gain (Loss) on Derivatives 20 10
Total Gain (Loss) on Derivatives, Gross 13 63
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives 12 20
Realized Gain (Loss) on Derivatives (1) (1)
Total Gain (Loss) on Derivatives, Gross 11 19
Trading [Member] | Floor Income Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives 53 27
Realized Gain (Loss) on Derivatives (20) (138)
Total Gain (Loss) on Derivatives, Gross 33 (111)
Trading [Member] | Other [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives (4) (2)
Realized Gain (Loss) on Derivatives (2)  
Total Gain (Loss) on Derivatives, Gross (6) (2)
Designated as Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives (101) (586)
Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives 34 618
Realized Gain (Loss) on Derivatives 25 55
Unrealized Gain (Loss) on Hedged Item (101) (586)
Total Gain (Loss) on Derivatives, Gross (42) 87
Designated as Hedging Instrument [Member] | Fair Value [Member] | Interest Rate Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives (84) 244
Realized Gain (Loss) on Derivatives 54 71
Unrealized Gain (Loss) on Hedged Item 61 (280)
Total Gain (Loss) on Derivatives, Gross 31 35
Designated as Hedging Instrument [Member] | Fair Value [Member] | Cross-Currency Interest Rate Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Gain (Loss) on Derivatives 118 374
Realized Gain (Loss) on Derivatives (29) (16)
Unrealized Gain (Loss) on Hedged Item (162) (306)
Total Gain (Loss) on Derivatives, Gross (73) 52
Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Realized Gain (Loss) on Derivatives (16)  
Total Gain (Loss) on Derivatives, Gross (16)  
Designated as Hedging Instrument [Member] | Cash Flow [Member] | Interest Rate Swaps [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Realized Gain (Loss) on Derivatives (16)  
Total Gain (Loss) on Derivatives, Gross (16)  
Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Less: realized gains (losses) recorded in interest expense 9 55
Realized Gain (Loss) on Derivatives $ 9 $ 55