Share Repurchase Program (Narrative) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended		9 Months Ended		1 Months Ended	46 Months Ended
	Aug. 13, 2014	Feb. 05, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Nov. 07, 2014 Subsequent Event [Member]	Nov. 07, 2014 Subsequent Event [Member]
Share repurchase program
Increase in authorized amount	$ 500,000,000	$ 500,000,000
Cumulative authorized amount	4,500,000,000
Authorization effective period	3 years	3 years
Remaining balance under share repurchase program			458,600,000		458,600,000
Common stock repurchased, shares			2,542	1,534	4,564	6,548	1,100	46,300
Common stock repurchased, average price per share			$ 152.42	$ 120.71	$ 150.55	$ 104.93	$ 151.05	$ 90.99
Common stock repurchased, value			$ 387,461,000	$ 185,226,000	$ 687,086,000	$ 687,064,000	$ 172,300,000	$ 4,200,000,000