Future Contract Benefits - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 41,304	$ 40,002
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,350	3,241
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,039	2,008	$ 2,001
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,617	3,504	$ 3,514
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,759	5,628
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	17,622	16,663
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	8,917	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