Share Repurchase Program and Treasury Stock (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
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	580,300,000
Shares Purchased Under Share Repurchase Program	19,300,000
Treasury Stock, Value, Acquired, Cost Method	$ 135,800,000	$ 114,200,000
Number of shares repurchased	797,095	688,079
Average price of share repurchased, per share	$ 170.31	$ 165.92
Exercise of stock options and restricted stock units, shares reissued	233,146	146,898