Derivatives - Schedule of Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 376	$ 655
Gross  amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	376	655
Derivative assets available for offset	(83)	(76)
Collateral pledged	(98)	(169)
Net amount	195	410
Derivative liabilities not subject to master netting agreements	$ 26	$ 16
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Derivatives, interest rate contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 368	$ 649
Gross  amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	368	649
Derivative assets available for offset	(79)	(73)
Collateral pledged	(94)	(168)
Net amount	195	408
Forward contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	8	6
Gross  amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	8	6
Derivative assets available for offset	(4)	(3)
Collateral pledged	(4)	(1)
Net amount	$ 0	$ 2