Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:
Services	$ 22,257	$ 22,196	$ 19,692
Product sales	7,145	6,307	5,137
Total revenue	29,402	28,503	24,829
Operating costs and expenses:
Cost of services	18,959	18,447	15,432
Cost of sales	5,972	5,322	4,379
Loss Contingency, Loss in Period	1,000	300	0
General and administrative	333	275	281
Total operating costs and expenses	26,264	24,344	20,092
Operating income	3,138	4,159	4,737
Interest expense, net of interest income of $8, $7, and $5	(331)	(298)	(263)
Other, net	(43)	(39)	(25)
Income from continuing operations before income taxes	2,764	3,822	4,449
Provision for income taxes	(648)	(1,235)	(1,439)
Income from continuing operations	2,116	2,587	3,010
Income (loss) from discontinued operations, net of income tax benefit (provision) of $1, $82, and $(18)	19	58	(166)
Net income	2,135	2,645	2,844
Noncontrolling interest in net income of subsidiaries	(10)	(10)	(5)
Net income attributable to company	2,125	2,635	2,839
Amounts attributable to company shareholders:
Income from continuing operations	2,106	2,577	3,005
Income (loss) from discontinued operations, net	19	58	(166)
Net income attributable to company	$ 2,125	$ 2,635	$ 2,839
Basic income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 2.35	$ 2.78	$ 3.27
Income (loss) from discontinued operations, net (in dollars per share)	$ 0.02	$ 0.07	$ (0.18)
Net income per share (in dollars per share)	$ 2.37	$ 2.85	$ 3.09
Diluted income per share attributable to company shareholders:
Income from continuing operations (in dollars per share)	$ 2.33	$ 2.78	$ 3.26
Income (loss) from discontinued operations, net (in dollars per share)	$ 0.03	$ 0.06	$ (0.18)
Net income per share (in dollars per share)	$ 2.36	$ 2.84	$ 3.08
Basic weighted average common shares outstanding (in shares)	898	926	918
Diluted weighted average common shares outstanding (in shares)	902	928	922