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Segment Information (Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated Net Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit) $ (37) $ (565) $ 29 $ (15) $ 146 $ 50 $ 131 $ 35 $ (589) $ 362 $ (76)
Annuities Segment [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                 207 241 149
Retirement Plan Services Segment [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                 35 48 24
Life Insurance Segment [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                 (552) 119 (33)
Group Protection Segment [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                 28 (34) 11
Other Operations [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                 (117) (106) (82)
Excluded Realized Gain (Loss), Pre-Tax [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                 28 48 (151)
Gain (loss) on early extinguishment of debt [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                   (2) (3)
Benefit ratio unlocking [Member]                      
Reconciliation of Federal Income Tax Expense (Benefit) from Segments to Consolidated [Abstract]                      
Income tax expense (benefit)                 $ (218) 52 51
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)
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)                   $ (4) $ (5)