Future Contract Benefit (Summary of Reconciliation of Future Contract Benefits) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 37,860	$ 38,302
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,252	3,190
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	1,943	2,003
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	14,899	14,777
Group Protection Segment [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,373	5,462
Other Operations [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	9,157	9,651
Protective [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	5,300	5,400
Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	3,236	3,219
Swiss Re [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Future contract benefits	$ 2,000	$ 2,200