Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues:
Total revenues	$ 437	$ 436	$ 1,302	$ 1,256
Costs and expenses:
Selling, general and administrative	89	90	261	237
Depreciation and amortization	74	95	221	274
Impairment loss				14
Reduction of gain on sale leaseback		4		4
Operating income	37	7	86	18
Interest expense, net	(25)	(36)	(127)	(133)
Other income, net	(2)	(91)	(6)	(98)
Income (loss) before taxes	14	62	(35)	(17)
Income tax benefit		(22)	(10)	(22)
Equity in income from joint ventures, net of tax				(1)
Income (loss) from continuing operations	14	84	(25)	6
Income from operations of discontinued operations, net of tax				32
Gain on disposal of discontinued operations, net of tax		1		305
Income from discontinued operations, net of tax		1		337
Net income (loss)	$ 14	$ 85	$ (25)	$ 343
Basic net income (loss) per common share:
Basic income (loss) from continuing operations (in dollars per share)	$ 0.19	$ 1.38	$ (0.36)	$ 0.10
Basic income from discontinued operations, net of tax (in dollars per share)		0.02		5.56
Basic net income (loss) per common share (in dollars per share)	0.19	1.40	(0.36)	5.66
Diluted net income (loss) per common share:
Diluted income (loss) from continuing operations (in dollars per share)	0.19	1.32	(0.36)	0.10
Diluted income from discontinued operations, net of tax (in dollars per share)		0.02		5.39
Diluted net income (loss) per common share (in dollars per share)	$ 0.19	$ 1.34	$ (0.36)	$ 5.49
Product
Revenues:
Total revenues	$ 166	$ 161	$ 498	$ 425
Costs and expenses:
Product and service costs, excluding depreciation and amortization	144	145	448	434
Service
Revenues:
Total revenues	271	275	804	831
Costs and expenses:
Product and service costs, excluding depreciation and amortization	$ 93	$ 95	$ 286	$ 275