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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | [1] | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 816 | $ 418 | $ 411 | $ 435 | $ 189 | $ 467 | $ 325 | $ 211 | $ 2,079 | $ 1,192 | $ 1,154
Annuities Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 1,074 | 935 | 996
Retirement Plan Services Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 149 | 127 | 140
Life Insurance Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 536 | 515 | 370
Group Protection Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 103 | 65 | 43
Other Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (108) | (102) | (154)
Excluded realized gain (loss), after-tax [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (218) | (337) | (214)
Gain (loss) on early extinguishment of debt, after-tax [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (3) | (41) |
Income (loss) from reserve changes (net of related amortization) on business sold through reinsurance, after-tax [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  |  | 2 | 2
Benefit ratio unlocking, after-tax [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 129 | $ 28 | $ (29)
Net Impact From the Tax Cuts And Jobs Act [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 1,322 |  |
Impairment of intangibles, after-tax [Member] |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | $ (905) |  |
[1] | Fourth quarter 2017 results include a goodwill impairment charge and the impacts of remeasuring our existing deferred tax balances for the impact of the Tax Act as disclosed elsewhere herein

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