Segment Information (Reconciliation Of Revenue From Segments To Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 4,435	$ 3,531	$ 9,124	$ 7,772
Excluded Realized Gain (Loss), Pre-Tax [Member]
Segment Reporting Information [Line Items]
Total revenues	(225)	(482)	(63)	(537)
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,136	951	2,233	1,972
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	329	278	651	571
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,911	1,541	3,730	3,264
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	1,246	1,199	2,500	2,423
Other Operations [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 38	$ 44	$ 73	$ 79