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Stock-Based 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
Pre-tax compensation expense	$ 10	$ 8	$ 26	$ 16
Long-term stock awards
Stock-based compensation
Pre-tax compensation expense	3	5	7	10
Stock options
Stock-based compensation
Pre-tax compensation expense	2	1	5	2
Restricted stock units
Stock-based compensation
Pre-tax compensation expense	3	0	11	0
Performance Restricted Stock Units
Stock-based compensation
Pre-tax compensation expense	0	1	1	2
Phantom stock awards and stock appreciation rights
Stock-based compensation
Pre-tax compensation expense	$ 2	$ 1	$ 2	$ 2

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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