Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Revenues	$ 1,041	$ 1,098	$ 3,108	$ 3,368
Operating Costs and Expenses
Cost of services (excluding depreciation and amortization)	779	859	2,406	2,644
Selling, general and administrative (excluding depreciation and amortization)	122	112	349	360
Research and development (excluding depreciation and amortization)	0	1	1	6
Depreciation and amortization	112	115	344	342
Restructuring and related costs	20	8	56	50
Interest expense	14	20	46	60
Goodwill impairment	0	0	0	1,351
(Gain) loss on divestitures and transaction costs	8	3	14	19
Litigation costs (recoveries), net	0	2	20	15
Other (income) expenses, net	(1)	(8)	0	(8)
Total Operating Costs and Expenses	1,054	1,112	3,236	4,839
Income (Loss) before Income Taxes	(13)	(14)	(128)	(1,471)
Income tax expense (benefit)	(6)	2	(21)	(118)
Net (Loss) Income	$ (7)	$ (16)	$ (107)	$ (1,353)
Earnings Per Share, Basic	$ (0.04)	$ (0.09)	$ (0.54)	$ (6.52)
Earnings Per Share, Diluted	$ (0.04)	$ (0.09)	$ (0.54)	$ (6.52)