Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
FHLB restricted stock	$ 40	$ 34
Debt Securities, Trading	12	8
Restricted Cash and Cash Equivalent	2	2
Total restricted assets	2,250	2,371
Pledged Collateral	1,510	1,238
Securities pledged as collateral
Loss Contingencies [Line Items]
Fair value of loaned securities	544	871
Securities Pledged under repurchase agreements, carrying value	0	85
Other Commitments [Line Items]
Securities Pledged under repurchase agreements, carrying value	0	85
Securities Owned and Pledged as Collateral	142	133
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged	$ 686	$ 1,089

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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