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	$ 4,912	$ 4,571	$ 14,036	$ 12,343
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	(75)	(71)	(137)	(609)
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,158	1,082	3,389	3,055
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	325	307	977	878
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	2,225	2,032	5,956	5,297
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,243	1,184	3,742	3,607
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 36	$ 37	$ 109	$ 115