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Derivative Financial Instruments - Derivative Notional Values (Detail) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Derivative [Line Items]    
Total Derivative Notional Values $ 86,800,000,000 $ 103,600,000,000
Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 58,200,000,000 55,900,000,000
Floor Income Contracts [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 16,500,000,000 35,100,000,000
Cross-Currency Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 9,100,000,000 9,400,000,000
Other [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 3,000,000,000 3,200,000,000
Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 14,700,000,000 9,500,000,000
Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 20,300,000,000 21,700,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 14,700,000,000 9,500,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 11,500,000,000 12,600,000,000
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 8,800,000,000 9,100,000,000
Trading [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 51,800,000,000 72,400,000,000
Trading [Member] | Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 32,000,000,000 33,800,000,000
Trading [Member] | Floor Income Contracts [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 16,500,000,000 35,100,000,000
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]    
Derivative [Line Items]    
Total Derivative Notional Values 300,000,000 300,000,000
Trading [Member] | Other [Member]    
Derivative [Line Items]    
Total Derivative Notional Values $ 3,000,000,000 $ 3,200,000,000