Future Contract Benefits - 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	$ 42,201	$ 42,360
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,154	3,294
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	1,991	2,036	$ 2,039
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,487	3,521	$ 3,617
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	19,043	18,597
Other Operations
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	8,745	9,076
Other Operations | Protective
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,200	5,400
Other Operations | Swiss Re
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 1,900	$ 1,900