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Stock-based Compensation (Schedule Of Compensation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock-Based Compensation, Before Tax: [Abstract]
Stock options	$ 4	$ 4	$ 8	$ 9
Retention awards	14	20	32	42
Total stock-based compensation, before tax	18	24	40	51
Excess tax benefits from equity compensation plans	$ 2	$ 6	$ 35	$ 45

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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 share-based payment arrangement.

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

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