Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 4,571	$ 4,227	$ 12,343	$ 11,918
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Total revenues	(71)	(268)	(609)	(981)
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,082	1,024	3,055	3,177
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	307	293	878	877
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	2,032	1,995	5,297	5,264
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,184	1,136	3,607	3,429
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 37	$ 47	$ 115	$ 152