CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (548)	$ (118)	$ (352)
Foreign currency translation (loss) gain, net of tax	85	26	(99)
Pension and post-retirement loss, net of tax	(5)	(7)	(1)
Derivative financial instruments unrealized loss, net of tax	(6)	(11)	0
Total other comprehensive gain (loss)	74	8	(100)
Total comprehensive loss	(474)	(110)	(452)
Less: comprehensive income attributable to noncontrolling interest	(21)	(12)	0
Comprehensive (loss) income attributable to SGC	$ (495)	$ (122)	$ (452)