Statement of Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Statement of Income [Abstract]
Operating Revenues	$ 4,580,516	$ 3,941,124	$ 13,467,275	$ 11,501,944
Cost of revenues	2,961,497	2,548,451	8,719,520	7,390,536
Selling, administrative, and research and development expenses	836,433	720,776	2,477,578	2,184,267
Amortization of intangible assets	68,302	51,166	186,251	154,700
Impairment of goodwill and other intangible assets		1,006	0	1,006
Operating Income	714,284	619,725	2,083,926	1,771,435
Interest expense	(48,583)	(43,490)	(137,961)	(131,054)
Other income (expense)	24,682	961	45,934	7,046
Income from Continuing Operations Before Income Taxes	690,383	577,196	1,991,899	1,647,427
Income Taxes	200,250	174,142	412,000	523,285
Income from Continuing Operations	490,133	403,054	1,579,899	1,124,142
Income from Discontinued Operations	17,484	18,974	49,288	43,147
Total	$ 507,617	$ 422,028	$ 1,629,187	$ 1,167,289
Income Per Share from Continuing Operations:
Basic	$ 1.01	$ 0.80	$ 3.20	$ 2.24
Diluted	$ 1.00	$ 0.80	$ 3.17	$ 2.23
Income Per Share from Discontinued Operations:
Basic	$ 0.04	$ 0.04	$ 0.10	$ 0.09
Diluted	$ 0.04	$ 0.04	$ 0.10	$ 0.09
Net Income Per Share:
Basic	$ 1.04	$ 0.84	$ 3.30	$ 2.32
Diluted	$ 1.04	$ 0.84	$ 3.27	$ 2.31
Cash Dividends Per Share:
Paid	$ 0.34	$ 0.31	$ 1.02	$ 0.93
Declared	$ 0.36	$ 0.34	$ 1.04	$ 0.96
Shares of Common Stock Outstanding During the Period:
Average	486,253	500,751	494,159	502,141
Average assuming dilution	488,776	503,149	497,904	504,690