Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 42,177	$ 42,077
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,172	3,322
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	1,991	2,037	$ 2,039
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,704	3,755	$ 3,867
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,781	5,836
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	18,686	17,948
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	8,843	9,179
Protective \| Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,200	5,400
Swiss Re \| Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 2,000	$ 2,000