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Derivative Financial Instruments - Impact of Derivatives on Balance Sheet (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative Assets:    
Derivative assets $ 276 $ 357
Derivative Liabilities:    
Derivative liabilities (269) (533)
Net total derivatives 7 (176)
Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 273 351
Derivative Liabilities:    
Derivative liabilities (121) (322)
Net total derivatives 152 29
Trading [Member]    
Derivative Assets:    
Derivative assets 3 6
Derivative Liabilities:    
Derivative liabilities (148) (211)
Net total derivatives (145) (205)
Interest Rate Swaps [Member]    
Derivative Assets:    
Derivative assets 263 329
Derivative Liabilities:    
Derivative liabilities (9) (14)
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 260 323
Interest Rate Swaps [Member] | Trading [Member]    
Derivative Assets:    
Derivative assets 3 6
Derivative Liabilities:    
Derivative liabilities (9) (14)
Cross-Currency Interest Rate Swaps [Member]    
Derivative Assets:    
Derivative assets 13 28
Derivative Liabilities:    
Derivative liabilities (121) (322)
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 13 28
Derivative Liabilities:    
Derivative liabilities (121) (322)
Floor Income Contracts [Member]    
Derivative Liabilities:    
Derivative liabilities (139) (197)
Floor Income Contracts [Member] | Trading [Member]    
Derivative Liabilities:    
Derivative liabilities $ (139) $ (197)