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Segment Information (Reconciliation Of Income (Loss) From Operations By Segment To Consolidated Net Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) $ 225 $ 52
Excluded Realized Gain (Loss) [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) (180) (60)
Benefit Ratio Unlocking [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) 55 (349)
Acquisition And Integration Costs Related To Mergers And Acquisitions [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss)   4
Annuities Segment [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) 290 261
Retirement Plan Services Segment [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) 57 40
Life Insurance Segment [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) 107 171
Group Protection Segment [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) (26) 40
Other Operations [Member]    
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract]    
Net income (loss) $ (78) $ (47)