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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives $ (165) $ 226 $ 551 $ (408)
Realized Gain (Loss) on Derivatives (10) (67) (85) (123)
Unrealized Gain (Loss) on Hedged Item 184 (88) (401) 770
Unrealized Gain (Loss) on Derivatives, Net (165) 226 551 (408)
Total Gain (Loss) on Derivatives, Gross 9 71 65 239
Realized Gain (Loss) on Derivatives, Net (47) (156) (177) (309)
Unrealized Gain (Loss) on Hedged Item, Net 184 (88) (401) 770
Total Gain (Loss) On Derivatives, Net (28) (18) (27) 53
Designated as Hedging Instrument [Member] | Fair Value [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (204) 67 414 (655)
Realized Gain (Loss) on Derivatives 48 89 103 186
Unrealized Gain (Loss) on Hedged Item 184 (88) (401) 770
Total Gain (Loss) on Derivatives, Gross 28 68 116 301
Designated as Hedging Instrument [Member] | Fair Value [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 71 (235) 315 (115)
Realized Gain (Loss) on Derivatives 68 86 139 182
Unrealized Gain (Loss) on Hedged Item (68) 252 (347) 123
Total Gain (Loss) on Derivatives, Gross 71 103 107 190
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 (275) 302 99 (540)
Realized Gain (Loss) on Derivatives (20) 3 (36) 4
Unrealized Gain (Loss) on Hedged Item 252 (340) (54) 647
Total Gain (Loss) on Derivatives, Gross (43) (35) 9 111
Designated as Hedging Instrument [Member] | Cash Flow [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives (11)   (11)  
Total Gain (Loss) on Derivatives, Gross (11)   (11)  
Designated as Hedging Instrument [Member] | Cash Flow [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gain (Loss) on Derivatives (11)   (11)  
Total Gain (Loss) on Derivatives, Gross (11)   (11)  
Trading [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 39 159 137 247
Realized Gain (Loss) on Derivatives (47) (156) (177) (309)
Total Gain (Loss) on Derivatives, Gross (8) 3 (40) (62)
Trading [Member] | Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 11 (5) 63 13
Realized Gain (Loss) on Derivatives 11 9 20 20
Total Gain (Loss) on Derivatives, Gross 22 4 83 33
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 25 (5) 45 (5)
Realized Gain (Loss) on Derivatives (1) (1) (2) (2)
Total Gain (Loss) on Derivatives, Gross 24 (6) 43 (7)
Trading [Member] | Floor Income Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives 7 171 34 243
Realized Gain (Loss) on Derivatives (56) (163) (194) (325)
Total Gain (Loss) on Derivatives, Gross (49) 8 (160) (82)
Trading [Member] | Other [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Gain (Loss) on Derivatives (4) (2) (5) (4)
Realized Gain (Loss) on Derivatives (1) (1) (1) (2)
Total Gain (Loss) on Derivatives, Gross (5) (3) (6) (6)
Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Less: realized gains (losses) recorded in interest expense 37 89 92 186
Realized Gain (Loss) on Derivatives $ 37 $ 89 $ 92 $ 186