Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 42,010	$ 42,077
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,221	3,322
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	1,990	2,037	$ 2,033
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,703	3,755	$ 3,821
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,793	5,836
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	18,308	17,948
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	8,995	9,179
Protective | Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,300	5,400
Swiss Re | Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 2,000	$ 2,000