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	$ 3,517	$ 4,310	$ 7,942	$ 8,275
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,037	1,156	2,166	2,330
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	282	299	579	592
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,639	1,802	3,460	3,502
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,199	1,155	2,424	2,293
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	52	58	90	116
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Excluded realized gain (loss), pre-tax	(694)	(161)	(770)	(562)
Amortization of DFEL associated with benefit ratio unlocking, pre-tax	$ 2	$ 1	$ (7)	$ 4