Future Contract Benefits - 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	$ 40,908	$ 40,002
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,311	3,241
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,032	2,008	$ 2,034
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,566	3,504	$ 3,518
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	17,333	16,663
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	8,954	8,958
Other Operations [Member] | Protective
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,400	5,400
Other Operations [Member] | Swiss Re
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 1,700	$ 1,700