Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 01, 2019
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	$ 0		$ (1)	$ 1	$ 0
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(3)		(17)	(9)	0
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	2				$ 0
Foreign currency translation adjustments	(3)	$ (8)	(8)	33
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	2	0	0	0
Other comprehensive income before reclassifications, net of tax	(1)	8	(10)
Elimination of Predecessor Company Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss)		1
Elimination of Predecessor Company Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment		25
Elimination of Predecessor Company Other Comprehensive Income (Loss), Net of tax		26
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1)		(18)	(8)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	$ 0	$ 0	$ (2)	$ (2)