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Segment Information (Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated Net Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) $ (76) $ 33 $ 244
Annuities Segment [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) 149 139 183
Retirement Plan Services Segment [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) 24 23 29
Life Insurance Segment [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) (33) 47 147
Group Protection Segment [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) 11 63 50
Other Operations [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) (82) (92) (77)
Excluded Realized Gain (Loss) [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) (151) (167) (9)
Gain (Loss) On Early Extinguishment Of Debt [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) (3) (9) (5)
Benefit Ratio Unlocking [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) 51 74 (36)
Net Impact From the Tax Cuts And Jobs Act [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) (37) (17) (19)
Acquisition And Integration Costs Related To Mergers And Acquisitions [Member]      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]      
Income tax expense (benefit) $ (5) $ (28) $ (19)