Derivatives - Schedule of Derivative Assets and Collateral Received (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Gross amounts of recognized assets	$ 530	$ 576
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Balance Sheets	530	576
Derivative liabilities available for offset	(76)	(79)
Collateral received	(440)	(489)
Net amount	14	8
Derivative assets not subject to master netting agreements	$ 2	$ 1
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivatives, interest rate contracts
Derivative [Line Items]
Gross amounts of recognized assets	$ 522	$ 567
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Balance Sheets	522	567
Derivative liabilities available for offset	(73)	(75)
Collateral received	(436)	(486)
Net amount	13	6
Forward contracts
Derivative [Line Items]
Gross amounts of recognized assets	8	9
Gross amounts offset in the Balance Sheets	0	0
Net amounts of assets presented in the Balance Sheets	8	9
Derivative liabilities available for offset	(3)	(4)
Collateral received	(4)	(3)
Net amount	$ 1	$ 2