Segment Information (Reconciliation of Net Investment Income From Segments to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Abstract]
Total net investment income	$ 1,411	$ 1,295	$ 1,398	$ 1,411	$ 1,444	$ 1,575	$ 1,583	$ 1,509	$ 5,515	$ 6,111	$ 5,510
Annuities Segment [Member]
Net Investment Income [Abstract]
Total net investment income									1,463	1,400	1,272
Retirement Plan Services Segment [Member]
Net Investment Income [Abstract]
Total net investment income									976	991	933
Life Insurance Segment [Member]
Net Investment Income [Abstract]
Total net investment income									2,586	3,207	2,823
Group Protection Segment [Member]
Net Investment Income [Abstract]
Total net investment income									334	365	330
Other Operations [Member]
Net Investment Income [Abstract]
Total net investment income									$ 156	$ 148	$ 152