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Goodwill and Specifically Identifiable Intangible Assets (Schedule Of Intangible Assets By Reportable Segment) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Finite And Indefinife Lived Intangible Assets Net [Abstract] |  |  |
Gross carrying amount |  | $ 105 | $ 105
Accumulated amortization |  | 47 | 43
Retirement Plan Services Segment [Member] | Mutual Fund Contract Rights [Member] |  |  |
Finite And Indefinife Lived Intangible Assets Net [Abstract] |  |  |
Gross carrying amount | [1] | 5 | 5
Life Insurance Segment [Member] | Sales Force [Member] |  |  |
Finite And Indefinife Lived Intangible Assets Net [Abstract] |  |  |
Gross carrying amount |  | 100 | 100
Accumulated amortization |  | $ 47 | $ 43
[1] | No amortization recorded as the intangible asset has indefinite life.

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- Definition The aggregate gross carrying amounts (including any previously recognized impairment charges) of major finite-lived intangible assets, and the carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of intangible assets, excluding goodwill, having a projected indefinite period of benefit. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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