Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 1,238	$ 1,205
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	34	33
Debt Securities, Trading	8	11
Restricted Cash and Cash Equivalents	2	2
Total restricted assets	2,371	2,049
Collateral Pledged
Loss Contingencies [Line Items]
Securities pledged, Gross Unrealized Capital Losses	1,089	798
Securities pledged
Loss Contingencies [Line Items]
Securities Pledged under repurchase agreements, carrying value	85	0
Securities Loaned
Loss Contingencies [Line Items]
Fair value of loaned securities	$ 871	$ 645

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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