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Stock-Based Compensation (Narrative) (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 [Abstract]
Stock-based compensation expense	$ 4	$ 2	$ 13	$ 7
Stock-based compensation expense, net of tax	4	$ 2	11	$ 5
Total unrecognized compensation costs related to non-vested stock options, restricted share units and performance shares	$ 36		$ 36
Weighted-average period of recognition of stock-based compensation cost			2 years 6 months 10 days

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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