Future Contract Benefit (Summary of Gross Premiums and Interest Accretion) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Traditional Life [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	$ 293	$ 285	$ 885	$ 841
Interest accretion	31	30	94	87
Payout Annuities [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	16	49	88	92
Interest accretion	22	21	64	63
Group Protection [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	874	852	2,645	2,523
Interest accretion	39	33	122	111
UL and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross assessments	337	690	1,794	2,097
Interest accretion	$ 197	$ 175	$ 573	$ 446