Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,256	$ 1,494
Other comprehensive loss before reclassifications	(23)	(5)
Reclassified from Accumulated other comprehensive loss to earnings	2	1
Ending balance	1,276	1,256
Derivative Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0
Other comprehensive loss before reclassifications	(7)	(1)
Reclassified from Accumulated other comprehensive loss to earnings	0	1
Ending balance	(7)	0
Foreign Currency Translation Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(86)	(82)
Other comprehensive loss before reclassifications	(16)	(4)
Reclassified from Accumulated other comprehensive loss to earnings	2	0
Ending balance	$ (100)	$ (86)