Business Segments - Equity In Net Income (Loss) of Investees Accounted For By Equity Method (Details) - Operating Segments - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Equity in (Income) Loss	$ 31	$ 32	$ 10
Americas
Segment Reporting Information [Line Items]
Equity in (Income) Loss	31	32	11
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Equity in (Income) Loss	$ 0	$ 0	$ (1)