Segment Information (Reconciliation of Net Investment Income From Segments to Consolidated) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Abstract]
Total net investment income	$ 5,270	$ 5,844	$ 5,264
Annuities Segment [Member]
Net Investment Income [Abstract]
Total net investment income	1,385	1,316	1,192
Retirement Plan Services Segment [Member]
Net Investment Income [Abstract]
Total net investment income	965	983	924
Life Insurance Segment [Member]
Net Investment Income [Abstract]
Total net investment income	2,462	3,056	2,689
Group Protection Segment [Member]
Net Investment Income [Abstract]
Total net investment income	332	365	329
Other Operations [Member]
Net Investment Income [Abstract]
Total net investment income	$ 126	$ 124	$ 130