Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,256	$ 1,494
Other comprehensive loss before reclassifications	(30)	(5)
Gain reclassified from Accumulated other comprehensive loss to earnings		1
Ending balance	1,202	1,256
Derivative Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0
Other comprehensive loss before reclassifications	(8)	(1)
Gain reclassified from Accumulated other comprehensive loss to earnings		1
Ending balance	(8)	0
Foreign Currency Translation Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(86)	(82)
Other comprehensive loss before reclassifications	(22)	(4)
Gain reclassified from Accumulated other comprehensive loss to earnings		0
Ending balance	$ (108)	$ (86)