Share Repurchase Program and Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock Repurchase Program, Additional Authorized Amount				$ 2,000,000
Share Repurchase Program and Treasury Stock (Textuals) [Abstract]
Remaining Amount to Repurchase under the program				$ 1,100,000
Shares Purchased Under Share Repurchase Program				28,900,000
Treasury Stock, Value, Acquired, Cost Method	$ 200,000	$ 186,250	$ 186,250	$ 200,000	$ 372,500
Number of shares repurchased				(268,161)	(539,326)
Average price of share repurchased, per share				$ 745.80	$ 690.66
Exercise of stock options and restricted stock units, shares reissued				114,109	226,595