Derivatives - Derivative Liabilities and Collateral Pledged (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Derivative [Line Items]
Gross amounts of recognized liabilities	$ 440	$ 655
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	440	655
Derivative assets  available for offset	(87)	(76)
Collateral pledged	(113)	(169)
Net amount	240	410
Derivative liabilities not subject to master netting agreements	15	16
Interest rate derivative contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	429	649
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	429	649
Derivative assets  available for offset	(83)	(73)
Collateral pledged	(107)	(168)
Net amount	239	408
Forward contracts
Derivative [Line Items]
Gross amounts of recognized liabilities	11	6
Gross amounts offset in the Balance Sheets	0	0
Net amounts of liabilities presented in the Balance Sheets	11	6
Derivative assets  available for offset	(4)	(3)
Collateral pledged	(6)	(1)
Net amount	$ 1	$ 2