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Undiscounted and Discounted Future Benefit Payments and Gross Premiums (Details) - Life Policy Reserves - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Term Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity |  |  |  |
Undiscounted expected future benefit payments | $ 4,791 | $ 4,655 |  |
Undiscounted expected future gross premiums | 4,374 | 4,436 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 2,751 | 2,584 | $ 2,993 | $ 3,222
Discounted expected future gross premiums | 2,652 | 2,582 |  |
Whole Life Insurance |  |  |  |
Liability for Future Policy Benefit, Activity |  |  |  |
Undiscounted expected future benefit payments | 1,648 | 1,562 |  |
Undiscounted expected future gross premiums | 659 | 606 |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | 657 | 614 | $ 826 | $ 843
Discounted expected future gross premiums | $ 409 | $ 368 |  |

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