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Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | $ 38,848 | $ 39,864 |
Other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 3,322 | 3,371 |
Payout Annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 2,034 | 2,085 | $ 2,068
Traditional Life |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 3,793 | 3,841 | $ 3,681
Group Protection |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 5,640 | 5,689 |
UL and Other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 14,444 | 15,000 |
Other Operations |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 9,615 | 9,879 |
Protective | Other Operations |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 5,500 | 5,600 |
Swiss Re | Other Operations |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | $ 2,200 | $ 2,200 |

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