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Stock Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 7	$ 6	$ 18	$ 11
Unearned compensation cost related to the unvested portion of all stock-based awards	$ 42		$ 42
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments granted (shares)			1.7
Weighted average fair value per share granted (dollars per share)			$ 19.56
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments granted (shares)			0.5
Weighted average fair value per share granted (dollars per share)			$ 18.01

X

- Definition

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

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-Publisher FASB
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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