Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue:
Services	$ 25,039	$ 22,257	$ 22,196
Product sales	7,831	7,145	6,307
Total revenue	32,870	29,402	28,503
Operating costs and expenses:
Cost of services	21,060	18,959	18,447
Cost of sales	6,599	5,972	5,322
Loss Contingency, Loss in Period	(195)	1,000	300
General and administrative	309	333	275
Total operating costs and expenses	27,773	26,264	24,344
Operating income	5,097	3,138	4,159
Interest expense, net of interest income of $13, $8, and $7	(383)	(331)	(298)
Other, net	(2)	(43)	(39)
Income from continuing operations before income taxes	4,712	2,764	3,822
Provision for income taxes	(1,275)	(648)	(1,235)
Income from continuing operations	3,437	2,116	2,587
Income from discontinued operations, net of income tax (provision) benefit of $(9), $1, and $82	64	19	58
Net income	3,501	2,135	2,645
Noncontrolling interest in net income of subsidiaries	(1)	(10)	(10)
Net income attributable to company	3,500	2,125	2,635
Amounts attributable to company shareholders:
Income from continuing operations	3,436	2,106	2,577
Income from discontinued operations, net	64	19	58
Net income attributable to company	$ 3,500	$ 2,125	$ 2,635
Basic income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 4.05	$ 2.35	$ 2.78
Income (loss) from discontinued operations, net (in dollars per share)	$ 0.08	$ 0.02	$ 0.07
Net income per share (in dollars per share)	$ 4.13	$ 2.37	$ 2.85
Diluted income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 4.03	$ 2.33	$ 2.78
Income (loss) from discontinued operations, net (in dollars per share)	$ 0.08	$ 0.03	$ 0.06
Net income per share (in dollars per share)	$ 4.11	$ 2.36	$ 2.84
Basic weighted average common shares outstanding (in shares)	848	898	926
Diluted weighted average common shares outstanding (in shares)	852	902	928