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Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | $ 39,807 | $ 39,864
Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 3,264 | 3,371
Payout Annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 2,009 | 2,085
Traditional Life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 3,774 | 3,841
Group Protection |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 5,628 | 5,689
UL and Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 16,062 | 15,000
Other Operations |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 9,070 | 9,879
Protective | Other Operations |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | 5,400 | 5,600
Swiss Re | Other Operations |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Future contract benefits | $ 1,800 | $ 2,200

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