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Goodwill and Specifically Identifiable Intangible Assets (Changes In Carrying Amount Of Goodwill, By Reportable Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |
Goodwill Gross |  | $ 3,936 | $ 3,522
Accumulated impairment as of beginning-of-year |  | (2,154) | (2,154)
Acquisition accounting adjustments | $ (4) | 414 |
Impairment |  |  | (905)
Net goodwill as of end-of-year | 1,778 | 1,782 |
Annuities Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Gross |  | 1,040 | 1,040
Accumulated impairment as of beginning-of-year |  | (600) | (600)
Impairment |  |  |
Net goodwill as of end-of-year | 440 | 440 |
Retirement Plan Services Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Gross |  | 20 | 20
Impairment |  |  |
Net goodwill as of end-of-year | 20 | 20 |
Life Insurance Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Gross |  | 2,188 | 2,188
Accumulated impairment as of beginning-of-year |  | (1,554) | (1,554)
Impairment |  |  |
Net goodwill as of end-of-year | 634 | 634 |
Group Protection Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Gross |  | 688 | $ 274
Acquisition accounting adjustments | (4) | 414 |
Impairment |  |  |
Net goodwill as of end-of-year | $ 684 | $ 688 |

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