Share Repurchase Program (Narrative) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended		6 Months Ended		1 Months Ended	43 Months Ended
	Feb. 05, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Aug. 08, 2014 Subsequent Event [Member]	Aug. 08, 2014 Subsequent Event [Member]
Share repurchase program
Increase in authorized amount	$ 500,000,000
Cumulative authorized amount	4,000,000,000
Authorization effective period	3 years
Remaining balance under share repurchase program		346,100,000		346,100,000
Common stock repurchased, shares		1,873	2,546	2,022	5,013	1,200	43,800
Common stock repurchased, average price per share		$ 148.21	$ 107.61	$ 148.21	$ 100.10	$ 151.00	$ 87.47
Common stock repurchased, value		$ 277,561,000	$ 273,946,000	$ 299,625,000	$ 501,838,000	$ 177,800,000	$ 3,800,000,000