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Consolidated Statements of Shareholders' Equity Statement (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Trust for Benefit of Employees [Member]
Shareholders' equity, Beginning Balance at Dec. 31, 2011	$ 13,541.7us-gaap_StockholdersEquity	$ 724.1	$ 4,886.8	$ 14,897.8	$ (3,858.6)	$ (95.3)	$ (3,013.1)
Shares, Beginning Balance at Dec. 31, 2011		1,158,644				853
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income	4,088.6us-gaap_NetIncomeLoss			4,088.6
Other comprehensive income (loss)	61.5				61.5
Cash dividends	2,186.5us-gaap_Dividends			2,186.5
Retirement of treasury stock, shares		(14,912)				(14,912)
Retirement of treasury stock, value	0.1	9.3		711.7		721.1
Purchase for treasury, shares						16,918
Purchase for treasury, value	(819.2)					(819.2)
Issuance of stock under employee stock plans-net, shares		(2,761)				(9)
Issuance of stock under employee stock plans-net, value	62.4	1.8	65.2			1.0
Stock-based compensation	141.5		141.5
Stockholders' equity, other	(0.1)us-gaap_StockholdersEquityOther
Shareholders' equity, Ending Balance at Dec. 31, 2012	14,765.2us-gaap_StockholdersEquity	716.6	4,963.1	16,088.2	(3,797.1)	(192.4)	(3,013.2)
Shares, Ending Balance at Dec. 31, 2012		1,146,493				2,850
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income	4,684.8us-gaap_NetIncomeLoss			4,684.8
Other comprehensive income (loss)	1,794.4				1,794.4
Cash dividends	2,102.8us-gaap_Dividends			2,102.8
Retirement of treasury stock, shares		(32,406)				(32,406)
Retirement of treasury stock, value	0	20.3		1,677.8		1,698.1
Purchase for treasury, shares						30,400
Purchase for treasury, value	(1,600.0)					(1,600.0)
Issuance of stock under employee stock plans-net, shares		(3,541)				(11)
Issuance of stock under employee stock plans-net, value	55.1	2.2	58.0			0.7
Stock-based compensation	144.9		144.9
Shareholders' equity, Ending Balance at Dec. 31, 2013	17,631.4us-gaap_StockholdersEquity	698.5	5,050.0	16,992.4	(2,002.7)	(93.6)	(3,013.2)
Shares, Ending Balance at Dec. 31, 2013		1,117,628				833
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income	2,390.5us-gaap_NetIncomeLoss			2,390.5
Other comprehensive income (loss)	(1,989.1)				(1,989.1)
Cash dividends	2,108.1us-gaap_Dividends			2,108.1
Retirement of treasury stock, shares		(12,579)				(12,579)
Retirement of treasury stock, value	0	7.9		792.1		800.0
Purchase for treasury, shares						12,579
Purchase for treasury, value	(800.0)					(800.0)
Issuance of stock under employee stock plans-net, shares		(6,388)				(23)
Issuance of stock under employee stock plans-net, value	92.5	4.0	86.3			2.2
Stock-based compensation	156.0		156.0
Shareholders' equity, Ending Balance at Dec. 31, 2014	$ 15,373.2us-gaap_StockholdersEquity	$ 694.6	$ 5,292.3	$ 16,482.7	$ (3,991.8)	$ (91.4)	$ (3,013.2)
Shares, Ending Balance at Dec. 31, 2014		1,111,437				810