Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
FHLB restricted stock	$ 36	$ 34
Debt Securities, Trading	12	8
Restricted Cash and Cash Equivalent	2	2
Total restricted assets	2,179	2,371
Pledged Collateral	1,272	1,238
Securities pledged as collateral
Loss Contingencies [Line Items]
Fair value of loaned securities	579	871
Securities Pledged under repurchase agreements, carrying value	150	85
Other Commitments [Line Items]
Securities Pledged under repurchase agreements, carrying value	150	85
Securities Owned and Pledged as Collateral	128	133
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged	$ 857	$ 1,089