Derivative Financial Instruments - Additional Information (Detail) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments Gain Loss [Line Items]
Net positive exposure related to corporate derivatives	$ 6,000,000	$ 11,000,000
Euro and British Pound Sterling denominated bonds outstanding in securitization trusts	1,600,000
Notional of interest rate swaps entered into by the trusts to swap Prime to LIBOR	10,300,000,000	39,700,000,000
Net positive exposure on foreign currency swaps	0	0
Decrease in valuation due to net credit risk adjustments	5,000,000	6,000,000
Decrease in valuation due to liquidity adjustments	1,000,000	1,000,000
Derivative liability at fair value including accrued interest and premium receivable	197,000,000	266,000,000
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	8,700,000,000	$ 31,900,000,000
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	$ 298,000,000