Consolidated Statements of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Shares	Paid-in Capital in Excess of Par Value	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling interest in Consolidated Subsidiaries
Beginning balance at Dec. 31, 2009	$ 8,757	$ 2,669	$ 411	$ (5,002)	$ 10,863	$ (213)	$ 29
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends paid ($0.36 per share)	(327)	0	0	0	(327)	0	0
Stock plans	193	5	(37)	225	0	0	0
Common shares repurchased	(114)	0	0	(114)	0	0	0
Tax loss from exercise of options and restricted stock	(18)	0	(18)	0	0	0	0
Other	(21)	0	0	0	0	0	(21)
Total dividends and other transactions with shareholders	(287)	5	(55)	111	(327)	0	(21)
Treasury shares issued for acquisition	103	0	(17)	120	0	0	0
Comprehensive income (loss):
Net income	1,842	0	0	0	1,835	0	7
Other comprehensive income (loss):
Defined benefit and other postretirement plans adjustments, net	(27)	0	0	0	0	(26)	(1)
Other	(1)	0	0	0	0	(1)	0
Total Comprehensive income	1,814	0	0	0	1,835	(27)	6
Ending balance at Dec. 31, 2010	10,387	2,674	339	(4,771)	12,371	(240)	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends paid ($0.36 per share)	(330)	0	0	0	(330)	0	0
Stock plans	315	9	82	224	0	0	0
Tax loss from exercise of options and restricted stock	34	0	34	0	0	0	0
Total dividends and other transactions with shareholders	19	9	116	224	(330)	0	0
Comprehensive income (loss):
Net income	2,844	0	0	0	2,839	0	5
Other comprehensive income (loss):
Defined benefit and other postretirement plans adjustments, net	(34)	0	0	0	0	(33)	(1)
Other	0
Total Comprehensive income	2,810	0	0	0	2,839	(33)	4
Ending balance at Dec. 31, 2011	13,216	2,683	455	(4,547)	14,880	(273)	18
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends paid ($0.36 per share)	(333)	0	0	0	(333)	0	0
Stock plans	295	(1)	25	271	0	0	0
Other	3	0	6	0	0	0	(3)
Total dividends and other transactions with shareholders	(35)	(1)	31	271	(333)	0	(3)
Comprehensive income (loss):
Net income	2,645	0	0	0	2,635	0	10
Other comprehensive income (loss):
Defined benefit and other postretirement plans adjustments, net	(33)	0	0	0	0	(33)	0
Other	(3)	0	0	0	0	(3)	0
Total Comprehensive income	2,609	0	0	0	2,635	(36)	10
Ending balance at Dec. 31, 2012	$ 15,790	$ 2,682	$ 486	$ (4,276)	$ 17,182	$ (309)	$ 25