Share Repurchase Program and Treasury Stock (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Share Repurchase Program and Treasury Stock (Textuals) [Abstract]
Authorized amount under share repurchase program	$ 2,250,000,000
Remaining Amount to Repurchase under the program	749,400,000
Shares Purchased Under Share Repurchase Program	18,300,000
Treasury Stock, Value, Acquired, Cost Method	$ 171,179,000	$ 148,800,000	$ 239,998,000
Number of shares repurchased	1,061,666	1,310,936
Average price of share repurchased, per share	$ 161.22	$ 113.48
Exercise of stock options and restricted stock units, shares reissued	220,463	281,897
Other Treasury Stock Issuances	0	2,549