Future Contract Benefits - Summary of Reconciliation of Future Contract Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 40,174	$ 38,302
Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,343	3,219
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,084	2,003
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,553	3,190
Group Protection
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,689	5,462
UL and Other
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	15,752	14,777
Other Operations (1)
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,753	9,651
Other Operations (1) | Protective
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,600	5,400
Other Operations (1) | Swiss Re
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 2,100	$ 2,200