Share Repurchase Program (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended		55 Months Ended
	May. 29, 2015	Feb. 04, 2015	Aug. 07, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Aug. 07, 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				$ 704,400		$ 704,400
Common stock repurchased, shares				1,987	1,873	2,637	2,022
Common stock repurchased, average price per share				$ 221.50	$ 148.21	$ 218.05	$ 148.21
Common stock repurchased, value				$ 440,129	$ 277,561	$ 574,932	$ 299,625
Subsequent Event [Member]
Share repurchase program
Common stock repurchased, shares			200					49,200
Common stock repurchased, average price per share			$ 231.47					$ 98.57
Common stock repurchased, value			$ 57,200					$ 4,900,000