Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 40,665	$ 39,807
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,335	3,264
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,033	2,009	$ 2,034
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,821	3,774	$ 3,793
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,712	5,628
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	16,702	16,062
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,062	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	$ 1,800	$ 1,800