Segment Information Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) unit	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | unit	2
Long-lived Assets	$ 1,435	$ 2,448
North America [Member]
Segment Reporting Information [Line Items]
Long-lived Assets	435	753
UNITED STATES
Segment Reporting Information [Line Items]
Long-lived Assets	$ 306	$ 532