Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 3,531	$ 3,928	$ 7,772	$ 7,692
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Excluded realized gain (loss), pre-tax	(482)	(324)	(537)	(714)
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	951	1,065	1,972	2,153
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	278	296	571	585
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,541	1,686	3,264	3,269
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,199	1,155	2,423	2,293
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 44	$ 50	$ 79	$ 106