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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Net income (loss) | $ 411 | $ 325 | $ 846 | $ 536
Annuities Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 251 | 235 | 532 | 453
Retirement Plan Services Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 37 | 31 | 74 | 61
Life Insurance Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 133 | 120 | 263 | 195
Group Protection Segment [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | 35 | 15 | 42 | 20
Other Operations [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | (37) | (28) | (51) | (39)
Excluded realized gain (loss), after-tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | (34) | (57) | (85) | (159)
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 discontinued operations, after-tax |  |  |  | 1
Benefit ratio unlocking, after-tax [Member] |  |  |  |
Reconciliation of Net Income (Loss) from Segments to Consolidated [Abstract] |  |  |  |
Income (loss) from continuing operations | $ 26 | $ 9 | $ 71 | $ 4

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