Future Contract Benefits (Summary of Gross Premiums and Interest Accretions) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Group Protection [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 885	$ 3,393
Interest accretion	42	141
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	915	2,818
Interest accretion	186	626
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	295	1,136
Interest accretion	32	117
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	28	133
Interest accretion	$ 21	$ 84