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	$ 5,361	$ 4,638	$ 13,303	$ 12,913
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,126	1,117	3,292	3,447
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	311	298	889	890
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	2,127	2,098	5,587	5,600
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,184	1,137	3,608	3,430
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	40	50	131	166
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	572	(61)	(198)	(623)
Amortization Of DFEL Associated With Benefit Ratio Unlocking, Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1	$ (1)	$ (6)	$ 3