Share Repurchase Program and Treasury Stock (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Share Repurchase Program and Treasury Stock (Textuals) [Abstract]
Authorized amount under share repurchase program	$ 3,000,000,000
Remaining Amount to Repurchase under the program	354,600,000
Shares Purchased Under Share Repurchase Program	23,500,000
Repurchases of common stock	$ (123,745,000)	$ (82,498,000)	$ (414,000,000)
Number of shares repurchased	400,845	336,188
Average price of share repurchased, per share	$ 308.69	$ 245.37
Exercise of stock options and restricted stock units, shares reissued	125,398	69,442