Share Repurchase Program (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended		58 Months Ended
	May. 29, 2015	Feb. 04, 2015	Nov. 06, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Nov. 06, 2015
Share Repurchase Program
Increase in authorized amount	$ 500,000	$ 500,000
Cumulative authorized amount	$ 5,500,000
Authorization effective period	3 years	3 years
Remaining balance under share repurchase program				$ 430,200		$ 430,200
Common stock repurchased, shares				1,147	2,542	3,784	4,564
Common stock repurchased, average price per share				$ 238.97	$ 152.42	$ 224.39	$ 150.55
Common stock repurchased, value				$ 274,213	$ 387,461	$ 849,145	$ 687,086
Subsequent event [Member]
Share Repurchase Program
Common stock repurchased, shares			100					50,300
Common stock repurchased, average price per share			$ 249.06					$ 101.51
Common stock repurchased, value			$ 32,300					$ 5,100,000