Future Contract Benefit - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 38,560	$ 39,864
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,311	3,371
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,002	2,085	$ 2,048
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,783	3,841	$ 3,676
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,570	5,689
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	14,501	15,000
Other Operations
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,393	9,879
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	$ 2,100	$ 2,200