Consolidated Statements Of Shareholders' Equity (USD $) In Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2010	$ 23,812.6	$ 3.8	$ 12,862.6	$ 10,721.6	$ 224.6
Balance (in shares) at Dec. 31, 2010		377.7
Net income	926.6			926.6
Other comprehensive income	26.8				26.8
Repurchase and retirement of common stock	(741.6)	(0.1)	(387.0)	(354.5)	0
Repurchase and retirement of common stock (in shares)	(11.4)	(11.4)
Dividends and dividend equivalents	(93.8)			(93.8)
Issuance of common stock under employee stock plans, net of related tax benefits	47.5	0	47.5	0	0
Issuance of common stock under employee stock plans, net of related tax benefits (in shares)		2.4
Balance at Mar. 31, 2011	23,978.1	3.7	12,523.1	11,199.9	251.4
Balance (in shares) at Mar. 31, 2011		368.7
Balance at Dec. 31, 2011	23,288.2	3.4	11,679.2	11,490.7	114.9
Balance (in shares) at Dec. 31, 2011		339.4
Net income	856.5			856.5
Other comprehensive income	120.1				120.1
Repurchase and retirement of common stock	(679.8)	(0.1)	(350.3)	(329.4)	0
Repurchase and retirement of common stock (in shares)	(10.2)	(10.2)
Dividends and dividend equivalents	(96.7)			(96.7)
Issuance of common stock under employee stock plans, net of related tax benefits	40.1	0	40.1	0	0
Issuance of common stock under employee stock plans, net of related tax benefits (in shares)		2.6
Balance at Mar. 31, 2012	$ 23,528.4	$ 3.3	$ 11,369.0	$ 11,921.1	$ 235.0
Balance (in shares) at Mar. 31, 2012		331.8