Derivative Financial Instruments - Collateral Held and Pledged (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Collateral held:
Cash (obligation to return cash collateral is recorded in short-term borrowings)	$ 60	$ 80
Securities at fair value - corporate derivatives (not recorded in financial statements)	0	0
Securities at fair value - on-balance sheet securitization derivatives (not recorded in financial statements)	0	0
Total collateral held	60	80
Derivative asset at fair value including accrued interest	62	85
Collateral pledged to others:
Cash (right to receive return of cash collateral is recorded in investments)	46	62
Total collateral pledged	46	62
Derivative liability at fair value including accrued interest and premium receivable	$ 197	$ 266