Statement of Income (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Operating Revenues	$ 4,219	$ 4,463	$ 8,228	$ 8,821
Cost of revenues	2,619	2,814	5,121	5,577
Selling, administrative, and research and development expenses	833	819	1,612	1,651
Amortization of intangible assets	65	72	133	141
Operating Income	702	758	1,362	1,452
Interest expense	(59)	(50)	(119)	(100)
Other income (expense)	11	24	57	32
Income from Continuing Operations Before Income Taxes	654	732	1,300	1,384
Income Taxes	190	213	377	401
Income from Continuing Operations	464	519	923	983
Income (Loss) from Discontinued Operations	1	362	(104)	384
Net Income	$ 465	$ 881	$ 819	$ 1,367
Income Per Share from Continuing Operations:
Basic (in dollars per share)	$ 1.03	$ 1.10	$ 2.05	$ 2.06
Diluted (in dollars per share)	$ 1.03	$ 1.09	$ 2.03	$ 2.04
Income (Loss) Per Share from Discontinued Operations:
Basic (in dollars per share)	$ 0.00	$ 0.76	$ (0.23)	$ 0.80
Diluted (in dollars per share)	$ 0.00	$ 0.76	$ (0.23)	$ 0.80
Net Income Per Share:
Basic (in dollars per share)	$ 1.04	$ 1.86	$ 1.82	$ 2.86
Diluted (in dollars per share)	$ 1.03	$ 1.85	$ 1.81	$ 2.84
Cash Dividends Per Share:
Paid (in dollars per share)	$ 0.38	$ 0.36	$ 0.38	$ 0.72
Declared (in dollars per share)	$ 0.38	$ 0.36	$ 0.76	$ 0.72
Shares of Common Stock Outstanding During the Period:
Average (in shares)	449.6	472.9	450.7	477.4
Average assuming dilution (in shares)	452.5	476.1	453.7	480.9