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	$ 297	$ 283	$ 592	$ 556
Interest accretion	32	29	63	57
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	44	21	71	43
Interest accretion	21	21	43	42
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
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	542	680	1,457	1,407
Interest accretion	$ 190	$ 137	$ 377	$ 270