Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Services	$ 4,118	$ 2,695	$ 10,971	$ 8,320
Product sales	1,326	1,138	3,709	3,546
Total revenue	5,444	3,833	14,680	11,866
Operating costs and expenses:
Cost of services	3,686	2,743	10,242	8,476
Cost of sales	1,069	919	3,008	2,843
General and administrative	55	43	185	132
Impairments and other charges	0	0	262	3,189
Merger-related costs and termination fee	0	0	0	4,057
Total operating costs and expenses	4,810	3,705	13,697	18,697
Operating income (loss)	634	128	983	(6,831)
Interest expense, net of interest income	(115)	(141)	(478)	(502)
Other, net	(23)	(39)	(67)	(117)
Income (loss) from continuing operations before income taxes	496	(52)	438	(7,450)
Income tax benefit (provision)	(135)	59	(81)	1,836
Income (loss) from continuing operations	361	7	357	(5,614)
Income (loss) from discontinued operations, net	0	0	0	(2)
Net income (loss)	361	7	357	(5,616)
Net (income) loss attributable to noncontrolling interest	4	(1)	4	2
Net income (loss) attributable to company	365	6	361	(5,614)
Amounts attributable to company shareholders:
Income (loss) from continuing operations	365	6	361	(5,612)
Income (loss) from discontinued operations, net	0	0	0	(2)
Net income (loss) attributable to company	$ 365	$ 6	$ 361	$ (5,614)
Basic net income (loss) per share	$ 0.42	$ 0.01	$ 0.42	$ (6.53)
Diluted income (loss) per share	$ 0.42	$ 0.01	$ 0.41	$ (6.53)
Basic weighted average common shares outstanding (in shares)	872	862	869	860
Diluted weighted average common shares outstanding (in shares)	873	864	872	860
Cash dividends per share	$ 0.18	$ 0.18	$ 0.54	$ 0.54