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]	Employee Stock Option [Member]
Shareholders' equity, Beginning Balance at Dec. 31, 2010	$ 12,420.3	$ 721.3	$ 4,798.5	$ 12,732.6	$ (2,670.1)	$ (96.4)	$ (3,065.6)
Shares, Beginning Balance at Dec. 31, 2010		1,154,018				864
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income	4,347.7			4,347.7
Other comprehensive income (loss)	(1,188.5)				(1,188.5)
Cash dividends	2,182.5			2,182.5
Retirement of treasury stock, shares		(1)				(1)
Retirement of treasury stock, value	0		(0.1)			0.1
Issuance of stock under employee stock plans-net, shares		(4,627)				(10)
Issuance of stock under employee stock plans-net, value	104.9	2.8	108.7			1.0
Stock-based compensation	147.4		147.4
ESOP transactions	102.1		49.7					52.4
Stockholders' equity, other	0.1
Shareholders' equity, Ending Balance at Dec. 31, 2011	13,541.7	724.1	4,886.8	14,897.8	(3,858.6)	(95.3)	(3,013.1)
Shares, Ending Balance at Dec. 31, 2011		1,158,644				853
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income	4,088.6			4,088.6
Other comprehensive income (loss)	61.5				61.5
Cash dividends	2,186.5			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
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)
Purchase for treasury, shares						16,918
Purchase for treasury, value	819.2					819.2
Stock-based compensation	141.5		141.5
Stockholders' equity, other	(0.1)
Shareholders' equity, Ending Balance at Dec. 31, 2012	14,765.2	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	4,684.8			4,684.8
Other comprehensive income (loss)	1,794.4				1,794.4
Cash dividends	2,102.8			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
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)
Purchase for treasury, shares						30,400
Purchase for treasury, value	1,600.0					1,600.0
Stock-based compensation	144.9		144.9
Shareholders' equity, Ending Balance at Dec. 31, 2013	$ 17,631.4	$ 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