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Derivative Financial Instruments - Impact of Derivatives on Balance Sheet (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Derivative Assets:    
Derivative assets $ 56 $ 224
Derivative Liabilities:    
Derivative liabilities (416) (260)
Net total derivatives (360) (36)
Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 56 222
Derivative Liabilities:    
Derivative liabilities (414) (190)
Net total derivatives (358) 32
Trading [Member]    
Derivative Assets:    
Derivative assets   2
Derivative Liabilities:    
Derivative liabilities (2) (70)
Net total derivatives (2) (68)
Interest Rate Swaps [Member]    
Derivative Assets:    
Derivative assets 56 224
Derivative Liabilities:    
Derivative liabilities (9) (5)
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Assets:    
Derivative assets 56 222
Derivative Liabilities:    
Derivative liabilities (7)  
Interest Rate Swaps [Member] | Trading [Member]    
Derivative Assets:    
Derivative assets   2
Derivative Liabilities:    
Derivative liabilities (2) (5)
Cross-Currency Interest Rate Swaps [Member]    
Derivative Liabilities:    
Derivative liabilities (407) (190)
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]    
Derivative Liabilities:    
Derivative liabilities $ (407) (190)
Floor Income Contracts [Member]    
Derivative Liabilities:    
Derivative liabilities   (65)
Floor Income Contracts [Member] | Trading [Member]    
Derivative Liabilities:    
Derivative liabilities   $ (65)