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