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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Gain (loss) on early extinguishment of debt, after-tax |  |  | $ (15) |
Net income (loss) | $ 398 | $ (161) | 356 | $ 454
Excluded Realized Gain (Loss), After-Tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | 452 | (49) | (156) | (492)
Gain (Loss) On Early Extinguishment Of Debt, After-Tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) |  | (33) | (12) | (33)
Benefit Ratio Unlocking, After-Tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | 83 | (2) | 17 | 186
Acquisition And Integration Costs Related To Mergers And Acquisitions, After-Tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | 4 | 31 | 12 | 80
Annuities Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | 196 | 169 | 694 | 686
Retirement Plan Services Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | 50 | 44 | 119 | 125
Life Insurance Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | (311) | (245) | (177) | 79
Group Protection Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | 6 | 61 | 85 | 184
Other Operations [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | $ (74) | $ (75) | $ (202) | $ (201)

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