Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 5,241	$ 5,361	$ 14,627	$ 13,303
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,267	1,126	3,720	3,292
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	328	311	989	889
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	2,325	2,127	6,293	5,587
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,243	1,184	3,743	3,608
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	42	40	125	131
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 36	572	(245)	(198)
Amortization Of DFEL Associated With Benefit Ratio Unlocking, Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues		$ 1	$ 2	$ (6)