Segment Information (Reconciliation of Assets From Segments to Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total assets	$ 392,015	$ 368,319
Annuities Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total assets	200,827	183,721
Retirement Plan Services Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total assets	47,633	45,379
Life Insurance Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total assets	106,973	102,806
Group Protection Segment [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total assets	10,522	10,201
Other Operations [Member]
Schedule Of Segment Reporting And Reconcilliation [Line Items]
Total assets	$ 26,060	$ 26,212