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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives $ 59 $ 374 $ 610 $ (34)
Realized Gain (Loss) on Derivatives 4 (73) (80) (196)
Unrealized Gain (Loss) on Hedged Item 94 (199) (307) 571
Unrealized Gain (Loss) on Derivatives, Net 59 374 610 (34)
Total Gain (Loss) on Derivatives, Gross 157 102 223 341
Realized Gain (Loss) on Derivatives, Net (16) (155) (192) (464)
Unrealized Gain (Loss) on Hedged Item, Net 94 (199) (307) 571
Total Gain (Loss) On Derivatives, Net 137 20 111 73
Designated as Hedging Instrument [Member] | Fair Value [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (37) 203 376 (452)
Realized Gain (Loss) on Derivatives 40 82 143 268
Unrealized Gain (Loss) on Hedged Item 94 (199) (307) 571
Total Gain (Loss) on Derivatives, Gross 97 86 212 387
Designated as Hedging Instrument [Member] | Fair Value [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (149) 209 166 95
Realized Gain (Loss) on Derivatives 62 83 201 265
Unrealized Gain (Loss) on Hedged Item 175 (234) (172) (111)
Total Gain (Loss) on Derivatives, Gross 88 58 195 249
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 112 (6) 210 (547)
Realized Gain (Loss) on Derivatives (22) (1) (58) 3
Unrealized Gain (Loss) on Hedged Item (81) 35 (135) 682
Total Gain (Loss) on Derivatives, Gross 9 28 17 138
Designated as Hedging Instrument [Member] | Cash Flow [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives (20)   (31)  
Total Gain (Loss) on Derivatives, Gross (20)   (31)  
Designated as Hedging Instrument [Member] | Cash Flow [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives (20)   (31)  
Total Gain (Loss) on Derivatives, Gross (20)   (31)  
Trading [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 96 171 234 418
Realized Gain (Loss) on Derivatives (16) (155) (192) (464)
Total Gain (Loss) on Derivatives, Gross 80 16 42 (46)
Trading [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (20) 82 44 94
Realized Gain (Loss) on Derivatives 14 10 35 30
Total Gain (Loss) on Derivatives, Gross (6) 92 79 124
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 6 7 51 3
Realized Gain (Loss) on Derivatives (1) (1) (3) (3)
Total Gain (Loss) on Derivatives, Gross 5 6 48  
Trading [Member] | Floor Income Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 113 69 147 312
Realized Gain (Loss) on Derivatives (28) (164) (222) (489)
Total Gain (Loss) on Derivatives, Gross 85 (95) (75) (177)
Trading [Member] | Other [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (3) 13 (8) 9
Realized Gain (Loss) on Derivatives (1)   (2) (2)
Total Gain (Loss) on Derivatives, Gross (4) 13 (10) 7
Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Less: realized gains (losses) recorded in interest expense 20 82 112 268
Realized Gain (Loss) on Derivatives $ 20 $ 82 $ 112 $ 268