Segment Information (Reconciliation Of Assets From Segments To Consolidated) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 365,948	$ 334,761
Annuities Segment [Member]
Segment Reporting Information [Line Items]
Total assets	184,678	167,443
Retirement Plan Services Segment [Member]
Segment Reporting Information [Line Items]
Total assets	45,372	40,184
Life Insurance Segment [Member]
Segment Reporting Information [Line Items]
Total assets	101,941	92,561
Group Protection Segment [Member]
Segment Reporting Information [Line Items]
Total assets	10,201	9,467
Other Operations [Member]
Segment Reporting Information [Line Items]
Total assets	$ 23,756	$ 25,106