Consolidated Statements Of Shareholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2012	$ 23,802.7	$ 3.0	$ 10,853.5	$ 12,647.1	$ 299.1
Balance (in shares) at Dec. 31, 2012		304.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	885.2			885.2
Other comprehensive income (loss)	43.4				43.4
Repurchase and retirement of common stock	(343.5)	0	(200.5)	(143.0)
Repurchase and retirement of common stock (in shares)	(5.5)	(5.5)
Convertible debenture tax adjustment	(4.0)		(4.0)
Dividends and dividend equivalents	(114.2)			(114.2)
Issuance of common stock under employee stock plans, net of related tax benefits	48.4		48.4
Issuance of common stock under employee stock plans, net of related tax benefits (in shares)		1.5
Balance at Mar. 31, 2013	24,318.0	3.0	10,697.4	13,275.1	342.5
Balance (in shares) at Mar. 31, 2013		300.7
Balance at Dec. 31, 2013	24,765.2	2.9	10,765.2	13,813.9	183.2
Balance (in shares) at Dec. 31, 2013		293.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	701.0			701.0
Other comprehensive income (loss)	144.2				144.2
Settlement of equity options	(19.4)		(19.4)
Repurchase and retirement of common stock	(1,262.8)	0	(884.3)	(378.5)
Repurchase and retirement of common stock (in shares)	(14.3)	(14.3)
Dividends and dividend equivalents	(124.9)			(124.9)
Issuance of common stock under employee stock plans, net of related tax benefits	142.0	0	142.0
Issuance of common stock under employee stock plans, net of related tax benefits (in shares)		2.9
Balance at Mar. 31, 2014	$ 24,345.3	$ 2.9	$ 10,003.5	$ 14,011.5	$ 327.4
Balance (in shares) at Mar. 31, 2014		281.9