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Retirement Plans (Schedule Of Projected Benefit Obligation And Accumulated Benefit Obligation In Excess Of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Plans[Abstract] |  |  |
Projected benefit obligation |  | $ 246 | $ 924
Accumulated benefit obligation | [1] | $ 246 | 223
Fair value of plan assets |  |  | $ 694
[1] | The projected and accumulated benefit obligation for the qualified pension plan was not in excess of plan assets as of December 31, 2020. The 2019 qualified pension plan contained $690 million of accumulated benefit obligations which were not in excess of plan assets.

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- Definition Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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