Future Contract Benefits - 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	$ 38,889	$ 40,174
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,289	3,343
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,001	2,084	$ 2,047
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,514	3,553	$ 3,372
Group Protection (1)
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,569	5,689
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	15,236	15,752
Other Operations
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,280	9,753
Other Operations | Protective
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,400	5,600
Other Operations | Swiss Re
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 2,000	$ 2,100