Derivative Financial Instruments - Additional Information (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Net positive exposure related to corporate derivatives	$ 11,000,000	$ 9,000,000
Euro and British Pound Sterling denominated bonds outstanding in securitization trusts	1,800,000,000
Notional of interest rate swaps entered into by the trusts to swap Prime to LIBOR	39,700,000,000	61,300,000,000
Net positive exposure on foreign currency swaps	0	0
Decrease in valuation due to net credit risk adjustments	6,000,000	8,000,000
Decrease in valuation due to liquidity adjustments	1,000,000	2,000,000
Derivative liability at fair value including accrued interest and premium receivable	266,000,000	271,000,000
Counterparty [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability at fair value including accrued interest and premium receivable	200,000
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional of interest rate swaps entered into by the trusts to swap Prime to LIBOR	31,900,000,000	$ 46,700,000,000
Interest Rate Swaps [Member] | Assets and Liabilities of Consolidated Variable Interest Entities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional of interest rate swaps entered into by the trusts to swap Prime to LIBOR	$ 468,000,000