Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 4,534	$ 4,425
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,204	1,129
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	327	297
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,939	1,821
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,254	1,224
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	38	38
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	(229)	(75)
Amortization Of DFEL Associated With Benefit Ratio Unlocking, Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1	$ (9)