Share Repurchase Program (Narrative) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended		31 Months Ended
	May 29, 2013	Aug. 08, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Aug. 08, 2013
Share Repurchase Program
Increase in authorized amount	$ 500,000,000
Cumulative authorized amount	3,500,000,000
Authorization effective period	3 years
Remaining balance under share repurchase program					576,800,000
Shares repurchased		500	2,546	4,518	5,013	6,288	37,600
Average price per share		$ 113.66	$ 107.61	$ 97.47	$ 100.10	$ 94.52	$ 79.27
Total investment		$ 56,300,000	$ 273,946,000	$ 440,369,000	$ 501,838,000	$ 594,355,000	$ 2,980,000,000