Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative assets	$ 55	$ 56
Impact of master netting agreements, Assets	0	0
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	$ 55	$ 56
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Cash collateral (held) pledged, Assets	$ (60)	$ (80)
Net position, Assets	(5)	(24)
Derivative liabilities	(190)	(258)
Impact of master netting agreements, Liabilities	0	0
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities	$ (190)	$ (258)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Cash collateral (held) pledged, Liabilities	$ 46	$ 62
Net position, Liabilities	$ (144)	$ (196)