Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 41,852	$ 39,807
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,359	3,264
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,052	2,009	$ 2,119
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,742	3,774	$ 3,938
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,794	5,628
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	17,637	16,062
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,268	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	$ 2,000	$ 1,800