CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Total revenue		$ 580	$ 539	$ 581	$ 453	$ 480	$ 432	$ 308	$ 479	$ 2,153	$ 1,699	$ 2,388
Operating expenses:
Cost of revenues		170	153	159	127	163	152	138	157
Selling, general and administrative										679	627	619
Research and development										190	148	166
Depreciation, amortization and impairments										398	449	542
Goodwill impairment										0	54	0
Restructuring and other										167	56	25
Operating income (loss)										110	(245)	290
Other (expense) income:
Interest expense										(478)	(503)	(589)
Loss on debt financing transactions										0	(1)	(100)
Gain (loss) on remeasurement of debt		11	12	(7)	25	(25)	(24)	(12)	10	41	(51)	9
Other income (expense), net										33	(4)	13
Total other expense, net										(404)	(559)	(667)
Net loss from continuing operations before income taxes										(294)	(804)	(377)
Income tax benefit										318	3	47
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		62	100	(51)	(88)	(143)	(187)	(254)	(216)	24	(801)	(330)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		37	87	164	79	59	76	56	61	366	253	212
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		99	187	113	(9)	(84)	(111)	(198)	(155)	$ 390	(548)	(118)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest											21	12
Net (loss) income attributable to SGC		$ 95	$ 182	$ 109	$ (15)	$ (90)	$ (117)	$ (203)	$ (159)		$ (569)	$ (130)
Income (Loss) from Continuing Operations, Per Basic Share		$ 0.60	$ 0.99	$ (0.58)	$ (0.98)	$ (1.57)	$ (2.03)	$ (2.74)	$ (2.34)	$ 0.06	$ (8.69)	$ (3.68)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share		0.38	0.90	1.71	0.82	0.62	0.80	0.59	0.65	3.80	2.67	2.28
Net income from discontinued operations
Basic (in dollars per share)		0.98	1.89	1.13	(0.16)	(0.95)	(1.23)	(2.15)	(1.69)	3.86	(6.02)	(1.40)
Income (Loss) from Continuing Operations, Per Diluted Share		0.58	0.96	(0.58)	(0.98)	(1.57)	(2.03)	(2.74)	(2.34)	0.05	(8.69)	(3.68)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share		0.37	0.88	1.71	0.82	0.62	0.80	0.59	0.65	3.72	2.67	2.28
Earnings Per Share, Diluted		$ 0.95	$ 1.84	$ 1.13	$ (0.16)	$ (0.95)	$ (1.23)	$ (2.15)	$ (1.69)	$ 3.77	$ (6.02)	$ (1.40)
Weighted average number of shares used in per share calculations:
Basic shares (in shares)		97	96	96	95	95	95	95	95	96	95	93
Weighted Average Number of Shares Outstanding, Diluted (in shares)		100	99	96	95	95	95	95	95	98	95	93
Services
Revenue:
Total revenue										$ 1,642	$ 1,259	$ 1,504
Operating expenses:
Cost of revenues	[1]									365	338	356
Product sales
Revenue:
Total revenue										511	440	884
Operating expenses:
Cost of revenues	[1]									$ 244	$ 272	$ 390

[1]  (1) Excludes D&A.