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Derivative Financial Instruments - Impact of Derivatives on Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivative Assets:    
Derivative assets $ 1,109 $ 728
Derivative Liabilities:    
Derivative liabilities (1,611) (1,515)
Net total derivatives (502) (787)
Interest Rate Swaps [Member]    
Derivative Assets:    
Derivative assets 1,098 726
Derivative Liabilities:    
Derivative liabilities (345) (160)
Cross-Currency Interest Rate Swaps [Member]    
Derivative Assets:    
Derivative assets 10 2
Derivative Liabilities:    
Derivative liabilities (852) (988)
Other [Member]    
Derivative Assets:    
Derivative assets 1  
Derivative Liabilities:    
Derivative liabilities (8) (2)
Floor Income Contracts [Member]    
Derivative Liabilities:    
Derivative liabilities (406) (365)
Designated as Hedging Instrument [Member] | Cash Flow [Member]    
Derivative Liabilities:    
Derivative liabilities (280) (89)
Net total derivatives (280) (89)
Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 1,016 696
Derivative Liabilities:    
Derivative liabilities (835) (929)
Net total derivatives 181 (233)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Cash Flow [Member]    
Derivative Liabilities:    
Derivative liabilities (280) (89)
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 1,006 694
Derivative Liabilities:    
Derivative liabilities   (3)
Designated as Hedging Instrument [Member] | Cross-Currency Interest Rate Swaps [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 10 2
Derivative Liabilities:    
Derivative liabilities (835) (926)
Trading [Member]    
Derivative Assets:    
Derivative assets 93 32
Derivative Liabilities:    
Derivative liabilities (496) (497)
Net total derivatives (403) (465)
Trading [Member] | Interest Rate Swaps [Member]    
Derivative Assets:    
Derivative assets 92 32
Derivative Liabilities:    
Derivative liabilities (65) (68)
Trading [Member] | Cross-Currency Interest Rate Swaps [Member]    
Derivative Liabilities:    
Derivative liabilities (17) (62)
Trading [Member] | Other [Member]    
Derivative Assets:    
Derivative assets 1  
Derivative Liabilities:    
Derivative liabilities (8) (2)
Trading [Member] | Floor Income Contracts [Member]    
Derivative Liabilities:    
Derivative liabilities $ (406) $ (365)