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Stock-based Compensation (Schedule Of Compensation) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stock-Based Compensation, Before Tax: [Abstract] |  |
Stock options | $ 4 | $ 4
Retention awards | 16 | 18
Total stock-based compensation, before tax | 20 | 22
Excess tax benefits from equity compensation plans | $ 15 | $ 33

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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=120383193&loc=d3e11374-113907 + Details
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