Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Services	$ 5,424	$ 4,191
Product sales	1,444	1,091
Total revenue	6,868	5,282
Operating costs and expenses:
Cost of services	4,533	3,428
Cost of sales	1,244	970
General and administrative	68	70
Total operating costs and expenses	5,845	4,468
Operating income	1,023	814
Interest expense, net of interest income of $2 and $1	(74)	(69)
Other, net	(7)	(4)
Income from continuing operations before income taxes	942	741
Provision for income taxes	(304)	(229)
Income from continuing operations	638	512
Loss from discontinued operations, net of income tax benefit of $5 and $0	(8)	(1)
Net income	630	511
Noncontrolling interest in net income of subsidiaries	(3)	0
Net income attributable to company	627	511
Amounts attributable to company shareholders:
Income from continuing operations	635	512
Loss from discontinued operations, net	(8)	(1)
Net income attributable to company	$ 627	$ 511
Basic income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 0.69	$ 0.56
Loss from discontinued operations, net (in dollars per share)	$ (0.01)	$ 0.00
Net income per share (in dollars per share)	$ 0.68	$ 0.56
Diluted income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 0.69	$ 0.56
Loss from discontinued operations, net (in dollars per share)	$ (0.01)	$ 0.00
Net income per share (in dollars per share)	$ 0.68	$ 0.56
Cash dividends per share (in dollars per share)	$ 0.09	$ 0.09
Basic weighted average common shares outstanding (in shares)	923	914
Diluted weighted average common shares outstanding (in shares)	926	919