Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, beginning (in shares) at Dec. 31, 2012		304.7
Balance, beginning at Dec. 31, 2012	$ 23,802.7	$ 3.0	$ 10,853.5	$ 12,647.1	$ 299.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,489.7			2,489.7
Other comprehensive loss	(115.9)				(115.9)
Premiums for and settlement of equity options	(7.9)		(7.9)
Repurchase and retirement of common stock, shares		(20.7)
Repurchase and retirement of common stock	(1,620.1)	$ (0.1)	(749.5)	(870.5)
Convertible debentures tax adjustment	(3.3)		(3.3)
Dividends and dividend equivalents	(452.4)			(452.4)
Issuance of common stock under employee stock plans, net of related tax benefits (in shares)		9.3
Issuance of common stock under employee stock plans, net of related tax benefits	672.4		672.4
Balance, ending (in shares) at Dec. 31, 2013		293.3
Balance, ending at Dec. 31, 2013	24,765.2	$ 2.9	10,765.2	13,813.9	183.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,569.7			2,569.7
Other comprehensive loss	(11.3)				(11.3)
Premiums for and settlement of equity options	$ (31.4)		(31.4)
Repurchase and retirement of common stock, shares	(30.4)	(30.4)
Repurchase and retirement of common stock	$ (2,998.8)	$ (0.2)	(1,115.5)	(1,883.1)
Dividends and dividend equivalents	(486.1)			(486.1)
Issuance of common stock under employee stock plans, net of related tax benefits (in shares)		5.2
Issuance of common stock under employee stock plans, net of related tax benefits	444.0		444.0
Balance, ending (in shares) at Dec. 31, 2014		268.1
Balance, ending at Dec. 31, 2014	24,251.3	$ 2.7	10,062.3	14,014.4	171.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,560.0			2,560.0
Other comprehensive loss	(464.5)				(464.5)
Premiums for and settlement of equity options	$ (14.0)		(14.0)
Repurchase and retirement of common stock, shares	(10.4)	(10.4)
Repurchase and retirement of common stock	$ (1,515.8)	$ (0.1)	(382.2)	(1,133.5)
Dividends and dividend equivalents	(662.4)			(662.4)
Issuance of common stock under employee stock plans, net of related tax benefits (in shares)		3.5
Issuance of common stock under employee stock plans, net of related tax benefits	308.2		308.2
Convertible debenture repurchases and conversions	(1,287.8)		(1,287.8)
Equity Units contract payments and issuance costs	(130.9)		(130.9)
Balance, ending (in shares) at Dec. 31, 2015		261.2
Balance, ending at Dec. 31, 2015	$ 23,044.1	$ 2.6	$ 8,555.6	$ 14,778.5	$ (292.6)