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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |
Goodwill Gross |  | $ 3,522 | $ 3,522
Accumulated impairment as of beginning-of-year |  | (1,249) | (1,249)
Impairment | $ (905) |  |
Net goodwill as of end-of-year | 1,368 | 2,273 |
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 |  | (649) | (649)
Impairment | (905) |  |
Net goodwill as of end-of-year | 634 | 1,539 |
Group Protection Segment [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill Gross |  | 274 | $ 274
Impairment |  |  |
Net goodwill as of end-of-year | $ 274 | $ 274 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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