CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Statement - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (75)	$ (6)	$ (99)	$ (208)
Other comprehensive loss:
Foreign currency translation (loss) gain, net of tax	(39)	(88)	16	(37)
Pension and post-retirement (loss) gain, net of tax	(1)	1	0	0
Derivative financial instruments unrealized (loss) gain, net of tax	(11)	4	(16)	6
Other comprehensive loss	(126)	(89)	(99)	(239)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	2	0	2	0
Comprehensive loss attributable to SGC	$ (128)	$ (89)	$ (101)	$ (239)