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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Loss Contingencies [Line Items] |  |
Pledged Collateral | $ 2,323 | $ 2,007
Possible losses in excess of amounts accrued | 25 |
Potential future loss | 97 |
Federal Home Loan Bank | Line of Credit |  |
Loss Contingencies [Line Items] |  |
Non-putable funding agreements issued to FHLB | 1,501 | $ 1,249
Acquisition of mortgage loans |  |
Loss Contingencies [Line Items] |  |
Amount of purchase commitments | 330 |
Purchase of limited partnership and private placement investments |  |
Loss Contingencies [Line Items] |  |
Amount of purchase commitments | 2,676 |
Purchase of limited partnership and private placement investments | VOEs |  |
Loss Contingencies [Line Items] |  |
Amount of purchase commitments | $ 393 |

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