Future Contract Benefit (Summary of Reconciliation of Future Contract Benefits) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 37,855	$ 38,302
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,372	3,190
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	2,047	2,003
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	14,126	14,777
Group Protection Segment [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,493	5,462
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,578	9,651
Protective [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,500	5,400
Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,239	3,219
Swiss Re [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 2,000	$ 2,000