Number of performance measures.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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- Definition

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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cash paid to settle liability for award under share-based payment arrangement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of shares issued under share-based payment arrangement.

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Stock Compensation - Additional Information (Details) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) perf_measure	Sep. 30, 2019 USD ($) perf_measure	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) perf_measure shares	Sep. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance measures \| perf_measure	2	2		2
Cash paid to settle RSUs				$ 2
Stock compensation expense		$ 5	$ 4	15	$ 13
Total unrecognized compensation cost related to nonvested awards granted and expected to vest	$ 27	$ 27		$ 27
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized	1 year 10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period \| shares				0.7
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period \| shares				0.2