Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue:
Services	$ 22,196	$ 19,692	$ 13,779
Product sales	6,307	5,137	4,194
Total revenue	28,503	24,829	17,973
Operating costs and expenses:
Cost of services	18,747	15,432	11,227
Cost of sales	5,322	4,379	3,508
General and administrative	275	281	229
Total operating costs and expenses	24,344	20,092	14,964
Operating income	4,159	4,737	3,009
Interest expense, net of interest income of $7, $5, and $11	(298)	(263)	(297)
Other, net	(39)	(25)	(57)
Income from continuing operations before income taxes	3,822	4,449	2,655
Provision for income taxes	(1,235)	(1,439)	(853)
Income from continuing operations	2,587	3,010	1,802
Income (loss) from discontinued operations, net of income tax (provision) benefit of $82, $(18), and $75	58	(166)	40
Net income	2,645	2,844	1,842
Noncontrolling interest in net income of subsidiaries	(10)	(5)	(7)
Net income attributable to company	2,635	2,839	1,835
Amounts attributable to company shareholders:
Income from continuing operations	2,577	3,005	1,795
Income (loss) from discontinued operations, net	58	(166)	40
Net income attributable to company	$ 2,635	$ 2,839	$ 1,835
Basic income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 2.78	$ 3.27	$ 1.98
Income (loss) from discontinued operations, net (in dollars per share)	$ 0.07	$ (0.18)	$ 0.04
Net income per share (in dollars per share)	$ 2.85	$ 3.09	$ 2.02
Diluted income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 2.78	$ 3.26	$ 1.97
Income (loss) from discontinued operations, net (in dollars per share)	$ 0.06	$ (0.18)	$ 0.04
Net income per share (in dollars per share)	$ 2.84	$ 3.08	$ 2.01
Basic weighted average common shares outstanding (in shares)	926	918	908
Diluted weighted average common shares outstanding (in shares)	928	922	911