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Goodwill and Specifically Identifiable Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023
Goodwill [Line Items] |  |  |
Future sales volume and product mix used to forecast |  | 10 years |
Goodwill impairment loss |  | $ 0 | $ 0
Life Insurance |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment loss | $ 634 |  |

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