Future Contract Benefit (Summary of Reconciliation of Future Contract Benefits) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 39,757	$ 38,826
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,681	3,509
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,068	2,004
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	15,384	14,818
Group Protection [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,492	5,462
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,883	9,782
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,249	3,251
Protective [Member] | Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,500	5,400
Swiss Re [Member] | Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 2,300	$ 2,300