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		9 Months Ended		34 Months Ended
	May 29, 2013	Nov. 08, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Nov. 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					391,600,000
Shares repurchased		700	1,534	6,359	6,548	12,647	39,300
Average price per share		$ 124.72	$ 120.71	$ 84.76	$ 104.93	$ 89.62	$ 81.23
Total investment		$ 83,400,000	$ 185,226,000	$ 538,972,000	$ 687,064,000	$ 1,133,328,000	$ 3,200,000,000