CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 18	$ (352)	$ (75)	$ (81)	$ (559)
Other comprehensive loss:
Foreign currency translation loss, net of tax	(38)	(8)		(22)	(46)
Derivative financial instruments unrealized gain (loss), net of tax	3	3		(13)	9
Total comprehensive loss	(17)	(357)		(116)	(596)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	4	0	$ 2	6	0
Comprehensive (loss) income attributable to SGC	$ (21)	$ (357)		$ (122)	$ (596)