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Undiscounted and Discounted Future Benefit Payments and Gross Premiums (Details) - Life policy reserves: - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | $ 4,894 |  | $ 4,816 |
Undiscounted expected future gross premiums | 4,561 |  | 4,386 |
Discounted expected future benefit payments | 2,703 | $ 2,668 | 2,698 | $ 2,751
Discounted expected future gross premiums | 2,658 |  | 2,601 |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Undiscounted expected future benefit payments | 1,719 |  | 1,660 |
Undiscounted expected future gross premiums | 692 |  | 663 |
Discounted expected future benefit payments | 631 | $ 623 | 637 | $ 657
Discounted expected future gross premiums | $ 415 |  | $ 402 |

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