Future Contract Benefit (Summary of Gross Premiums and Interest Accretion) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	$ 313	$ 1,211
Interest Accretion	35	134
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	28	133
Interest Accretion	21	84
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	915	2,818
Interest Accretion	186	626
Group Protection [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	885	3,393
Interest Accretion	$ 42	$ 141