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Undiscounted and Discounted Future Benefit Payments and Gross Premiums (Details) - Life policy reserves: - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Term Life Insurance |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Undiscounted expected future benefit payments | $ 4,947 |  |  | $ 4,819 |  |
Undiscounted expected future gross premiums | 4,632 |  |  | 4,513 |  |
Discounted expected future benefit payments | 2,720 | $ 2,703 | $ 2,668 | 2,634 | $ 2,698 | $ 2,751
Discounted expected future gross premiums | 2,697 |  |  | 2,597 |  |
Whole Life Insurance |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |
Undiscounted expected future benefit payments | 1,709 |  |  | 1,680 |  |
Undiscounted expected future gross premiums | 688 |  |  | 675 |  |
Discounted expected future benefit payments | 634 | $ 631 | $ 623 | 619 | $ 637 | $ 657
Discounted expected future gross premiums | $ 415 |  |  | $ 401 |  |

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