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Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | $ 41,053 | $ 39,807 |
Other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 3,375 | 3,264 |
Payout Annuities |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 2,039 | 2,009 | $ 2,002
Traditional Life |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 3,867 | 3,774 | $ 3,783
Group Protection |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 5,759 | 5,628 |
UL and Other |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 16,989 | 16,062 |
Other Operations [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 9,024 | 9,070 |
Protective | Other Operations [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | 5,400 | 5,400 |
Swiss Re | Other Operations [Member] |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Future contract benefits | $ 1,800 | $ 1,800 |

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