Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue:
Services	$ 19,692	$ 13,779	$ 10,832
Product sales	5,137	4,194	3,843
Total revenue	24,829	17,973	14,675
Operating costs and expenses:
Cost of services	15,432	11,227	9,219
Cost of sales	4,379	3,508	3,255
General and administrative	281	229	207
Total operating costs and expenses	20,092	14,964	12,681
Operating income	4,737	3,009	1,994
Interest expense, net of interest income of $5, $11, and $12	(263)	(297)	(285)
Other, net	(25)	(57)	(27)
Income from continuing operations before income taxes	4,449	2,655	1,682
Provision for income taxes	(1,439)	(853)	(518)
Income from continuing operations	3,010	1,802	1,164
Income (loss) from discontinued operations, net of income tax (provision) benefit of $(18), $75, and $5	(166)	40	(9)
Net income	2,844	1,842	1,155
Noncontrolling interest in net income of subsidiaries	(5)	(7)	(10)
Net income attributable to company	2,839	1,835	1,145
Amounts attributable to company shareholders:
Income from continuing operations	3,005	1,795	1,154
Income (loss) from discontinued operations, net	$ (166)	$ 40	$ (9)
Basic income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 3.27	$ 1.98	$ 1.28
Income (loss) from discontinued operations, net (in dollars per share)	$ (0.18)	$ 0.04	$ (0.01)
Net income per share (in dollars per share)	$ 3.09	$ 2.02	$ 1.27
Diluted income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 3.26	$ 1.97	$ 1.28
Income (loss) from discontinued operations, net (in dollars per share)	$ (0.18)	$ 0.04	$ (0.01)
Net income per share (in dollars per share)	$ 3.08	$ 2.01	$ 1.27
Basic weighted average common shares outstanding (in shares)	918	908	900
Diluted weighted average common shares outstanding (in shares)	922	911	902