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Derivative Financial Instruments - Derivative Notional Values (Detail) (USD $)
In Billions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Total Derivative Notional Values $ 110.1 $ 140.4
Cash Flow [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 0.7 0.7
Fair Value [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 27.1 29.5
Trading [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 82.3 110.2
Interest Rate Swaps [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 63.0 73.4
Interest Rate Swaps [Member] | Cash Flow [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 0.7 0.7
Interest Rate Swaps [Member] | Fair Value [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 16.0 15.8
Interest Rate Swaps [Member] | Trading [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 46.3 56.9
Floor Income Contracts [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 31.8 51.6
Floor Income Contracts [Member] | Trading [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 31.8 51.6
Cross-Currency Interest Rate Swaps [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 11.4 14.0
Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 11.1 13.7
Cross-Currency Interest Rate Swaps [Member] | Trading [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 0.3 0.3
Other [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values 3.9 1.4
Other [Member] | Trading [Member]
    
Derivative [Line Items]    
Total Derivative Notional Values $ 3.9 $ 1.4