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Stock-based Compensation (Schedule Of Compensation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-Based Compensation, Before Tax: [Abstract]
Stock options	$ 4	$ 5	$ 12	$ 14
Retention awards	13	19	45	61
Total stock-based compensation, before tax	17	24	57	75
Excess tax benefits from equity compensation plans	$ 16	$ 3	$ 51	$ 48

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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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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 option under share-based payment arrangement.

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