Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 18,601	$ 16,566	$ 16,192
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	(117)	(742)	(1,019)
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	4,566	4,067	4,240
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,308	1,197	1,186
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	7,692	7,086	6,999
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	4,995	4,792	4,587
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 157	$ 166	$ 199