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Derivative Financial Instruments - Impact of Derivatives on Consolidated Statements of Income (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 $ (247) $ 258 $ (254)
Realized Gain (Loss) on derivatives                 (208) (155) (59)
Unrealized Gain (Loss) on Hedged Item                 690 (141) 110
Derivative Gain (Loss) on Derivatives Net, Total                 235 (38) (203)
Less: realized gains (losses) recorded in interest expense                 503 590 756
Unrealized Gain (Loss) on Derivatives, Total                 (247) 258 (254)
Realized Gain (Loss) on derivatives, Total                 (711) (745) (815)
Unrealized Gain (Loss) on Hedged Item, Total                 690 (141) 110
Total Gain (Loss) (128) (127) 18 (31) (28) (233) 6 (372) (268) (628) (959)
Fair Value [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 (805) (33) (220)
Realized Gain (Loss) on derivatives                 512 616 795
Unrealized Gain (Loss) on Hedged Item                 690 (141) 110
Derivative Gain (Loss) on Derivatives Net, Total                 397 442 685
Fair Value [Member] | Interest Rate Swaps [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 (806) (75) 503
Realized Gain (Loss) on derivatives                 414 449 481
Unrealized Gain (Loss) on Hedged Item                 873 41 (554)
Derivative Gain (Loss) on Derivatives Net, Total                 481 415 430
Fair Value [Member] | Cross-Currency Interest Rate Swaps [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 1 42 (723)
Realized Gain (Loss) on derivatives                 98 167 314
Unrealized Gain (Loss) on Hedged Item                 (183) (182) 664
Derivative Gain (Loss) on Derivatives Net, Total                 (84) 27 255
Cash Flow [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                   (1) (1)
Realized Gain (Loss) on derivatives                 (9) (26) (39)
Derivative Gain (Loss) on Derivatives Net, Total                 (9) (27) (40)
Cash Flow [Member] | Interest Rate Swaps [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                   (1) (1)
Realized Gain (Loss) on derivatives                 (9) (26) (39)
Derivative Gain (Loss) on Derivatives Net, Total                 (9) (27) (40)
Trading [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 558 292 (33)
Realized Gain (Loss) on derivatives                 (711) (745) (815)
Derivative Gain (Loss) on Derivatives Net, Total                 (153) (453) (848)
Trading [Member] | Interest Rate Swaps [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 (107) (66) 183
Realized Gain (Loss) on derivatives                 71 108 69
Derivative Gain (Loss) on Derivatives Net, Total                 (36) 42 252
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 (101) (59) 29
Realized Gain (Loss) on derivatives                 35 7 8
Derivative Gain (Loss) on Derivatives Net, Total                 (66) (52) 37
Trading [Member] | Floor Income Contracts [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 785 412 (267)
Realized Gain (Loss) on derivatives                 (815) (859) (903)
Derivative Gain (Loss) on Derivatives Net, Total                 (30) (447) (1,170)
Trading [Member] | Other [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Unrealized Gain (Loss) on Derivatives                 (19) 5 22
Realized Gain (Loss) on derivatives                 (2) (1) 11
Derivative Gain (Loss) on Derivatives Net, Total                 $ (21) $ 4 $ 33