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Stock-based Compensation (Schedule Of Compensation) (Details) - USD ($) $ in Millions	3 Months Ended
	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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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.

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-Name Accounting Standards Codification
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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Amount of noncash expense for option under share-based payment arrangement.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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