Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative assets	$ 32	$ 55
Impact of master netting agreements, Assets	0	0
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	$ 32	$ 55
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Cash collateral (held) pledged, Assets	$ (34)	$ (60)
Net position, Assets	(2)	(5)
Derivative liabilities	(223)	(190)
Impact of master netting agreements, Liabilities	0	0
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities	$ (223)	$ (190)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Cash collateral (held) pledged, Liabilities	$ 38	$ 46
Net position, Liabilities	$ (185)	$ (144)