Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Services	$ 17,482	$ 25,039	$ 22,257
Product sales	6,151	7,831	7,145
Total revenue	23,633	32,870	29,402
Operating costs and expenses:
Cost of services	15,900	20,959	18,959
Cost of sales	5,213	6,571	5,972
Restructuring Charges	2,177	129	0
Business Combination, Acquisition Related Costs	308	17	0
General and administrative	200	292	333
Loss Contingency, Loss in Period	0	(195)	1,000
Total operating costs and expenses	23,798	27,773	26,264
Operating income (loss)	(165)	5,097	3,138
Interest expense, net of interest income of $16, $13, and $8	(447)	(383)	(331)
Other, net	(324)	(2)	(43)
Income (loss) from continuing operations before income taxes	(936)	4,712	2,764
Income tax benefit (provision)	274	(1,275)	(648)
Income (loss) from continuing operations	(662)	3,437	2,116
Income (loss) from discontinued operations, net of income tax benefit (provision) of $3, $(9), and $1	(5)	64	19
Net income (loss)	(667)	3,501	2,135
Net (income) attributable to noncontrolling interest	(4)	(1)	(10)
Net income (loss) attributable to company	(671)	3,500	2,125
Amounts attributable to company shareholders:
Income (loss) from continuing operations	(666)	3,436	2,106
Income (loss) from discontinued operations, net	(5)	64	19
Net income (loss) attributable to company	$ (671)	$ 3,500	$ 2,125
Basic income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ (0.78)	$ 4.05	$ 2.35
Income (loss) from discontinued operations, net (in dollars per share)	(0.01)	0.08	0.02
Net income per share (in dollars per share)	(0.79)	4.13	2.37
Diluted income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	(0.78)	4.03	2.33
Income (loss) from discontinued operations, net (in dollars per share)	(0.01)	0.08	0.03
Net income per share (in dollars per share)	$ (0.79)	$ 4.11	$ 2.36
Basic weighted average common shares outstanding (in shares)	853	848	898
Diluted weighted average common shares outstanding (in shares)	853	852	902