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	$ 19,230	$ 17,439	$ 17,258
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	5,002	4,455	4,600
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,324	1,213	1,200
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	8,137	7,516	7,438
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	4,996	4,793	4,588
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	180	185	220
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	(411)	(721)	(794)
Amortization Of DFEL Associated With Benefit Ratio Unlocking, Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 2	$ (2)	$ 6