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Business Segments - Equity In Net Income of Investees Accounted For By Equity Method (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Equity in income	$ 0	$ 0	$ 0
Operating Segments
Segment Reporting Information [Line Items]
Equity in income	10	(5)	(1)
Operating Segments \| Americas
Segment Reporting Information [Line Items]
Equity in income	11	(5)	0
Operating Segments \| Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Equity in income	$ (1)	$ 0	$ (1)

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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