Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Loss Contingencies [Line Items]
Pledged Collateral	$ 2,007	$ 1,956
FHLB restricted stock	65	64
Trading securities	35	37
Cash and cash equivalents	21	25
Total restricted assets	3,651	3,242
Securities pledged
Loss Contingencies [Line Items]
Securities loaned to lending agent	1,083	842
Securities pledged/obligations under repurchase agreements	281	117
Securities Loaned
Loss Contingencies [Line Items]
Securities Owned and Pledged as Collateral	159	201
Collateral pledged
Loss Contingencies [Line Items]
Securities pledged	$ 1,523	$ 1,160

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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