Segment Information (Reconciliation of Net Investment Income From Segments to Consolidated) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Investment Income [Abstract]
Total net investment income	$ 6,115,000,000	$ 5,510,000,000	$ 5,223,000,000
Annuities Segment [Member]
Net Investment Income [Abstract]
Total net investment income	1,401,000,000	1,272,000,000	1,140,000,000
Retirement Plan Services Segment [Member]
Net Investment Income [Abstract]
Total net investment income	992,000,000	933,000,000	924,000,000
Life Insurance Segment [Member]
Net Investment Income [Abstract]
Total net investment income	3,209,000,000	2,823,000,000	2,658,000,000
Group Protection Segment [Member]
Net Investment Income [Abstract]
Total net investment income	366,000,000	330,000,000	307,000,000
Other Operations [Member]
Net Investment Income [Abstract]
Total net investment income	$ 147,000,000	$ 152,000,000	$ 194,000,000