Future Contract Benefit (Summary of Gross Premiums and Interest Accretion) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	$ 314	$ 301	$ 627	$ 594
Interest Accretion	36	33	71	66
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	44	21	72	43
Interest Accretion	22	21	43	42
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	542	680	1,457	1,407
Interest Accretion	190	137	376	270
Group Protection [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	885	841	1,770	1,671
Interest Accretion	$ 41	$ 36	$ 83	$ 78