Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
Pledged Collateral	$ 2,294	$ 2,007
Possible losses in excess of amounts accrued	25
Potential future loss	93
Federal Home Loan Bank \| Line of Credit
Loss Contingencies [Line Items]
Non-putable funding agreements issued to FHLB	1,400	$ 1,249
Acquisition of mortgage loans
Loss Contingencies [Line Items]
Amount of purchase commitments	177
Purchase of limited partnership and private placement investments
Loss Contingencies [Line Items]
Amount of purchase commitments	2,269
Purchase of limited partnership and private placement investments \| VOEs
Loss Contingencies [Line Items]
Amount of purchase commitments	$ 397

Fair value of the amount outstanding under the credit facility.

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