Future Contract Benefits (Reconciliation of Future Contract Benefits) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	$ 39,245	$ 38,302
Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	3,225	3,219
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	15,344	14,777
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	2,067	2,003
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	3,366	3,190
Group Protection Segment [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	5,492	5,462
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	9,751	9,651
Protective [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	5,500	5,400
Swiss Re [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Total future contract benefits	$ 2,200	$ 2,200