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Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative Assets:    
Derivative assets $ 2,010 $ 2,785
Derivative Liabilities:    
Derivative liabilities (1,957) (2,499)
Net total derivatives 53 286
Interest Rate Swaps [Member]
    
Derivative Assets:    
Derivative assets 823 1,546
Derivative Liabilities:    
Derivative liabilities (364) (209)
Cross-Currency Interest Rate Swaps [Member]
    
Derivative Assets:    
Derivative assets 1,185 1,235
Derivative Liabilities:    
Derivative liabilities (186) (136)
Other [Member]
    
Derivative Assets:    
Derivative assets 2 4
Derivative Liabilities:    
Derivative liabilities (23)  
Floor Income Contracts [Member]
    
Derivative Liabilities:    
Derivative liabilities (1,384) (2,154)
Cash Flow [Member]
    
Derivative Assets:    
Derivative assets 24  
Derivative Liabilities:    
Derivative liabilities   (11)
Net total derivatives 24 (11)
Cash Flow [Member] | Interest Rate Swaps [Member]
    
Derivative Assets:    
Derivative assets 24  
Derivative Liabilities:    
Derivative liabilities   (11)
Fair Value [Member]
    
Derivative Assets:    
Derivative assets 1,923 2,561
Derivative Liabilities:    
Derivative liabilities (304) (137)
Net total derivatives 1,619 2,424
Fair Value [Member] | Interest Rate Swaps [Member]
    
Derivative Assets:    
Derivative assets 738 1,396
Derivative Liabilities:    
Derivative liabilities (149) (1)
Fair Value [Member] | Cross-Currency Interest Rate Swaps [Member]
    
Derivative Assets:    
Derivative assets 1,185 1,165
Derivative Liabilities:    
Derivative liabilities (155) (136)
Trading [Member]
    
Derivative Assets:    
Derivative assets 63 224
Derivative Liabilities:    
Derivative liabilities (1,653) (2,351)
Net total derivatives (1,590) (2,127)
Trading [Member] | Interest Rate Swaps [Member]
    
Derivative Assets:    
Derivative assets 61 150
Derivative Liabilities:    
Derivative liabilities (215) (197)
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]
    
Derivative Assets:    
Derivative assets   70
Derivative Liabilities:    
Derivative liabilities (31)  
Trading [Member] | Other [Member]
    
Derivative Assets:    
Derivative assets 2 4
Derivative Liabilities:    
Derivative liabilities (23)  
Trading [Member] | Floor Income Contracts [Member]
    
Derivative Liabilities:    
Derivative liabilities $ (1,384) $ (2,154)