Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 40,002	$ 40,174
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,241	3,343
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,008	2,084
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,504	3,553
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,628	5,689
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	16,663	15,752
Other Operations
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	8,958	9,753
Protective | Other Operations
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,400	5,600
Swiss Re | Other Operations
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 1,700	$ 2,100