Share Repurchase Program (Narrative) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended		1 Months Ended	40 Months Ended
	Feb. 05, 2014	Mar. 31, 2014	Mar. 31, 2013	May 09, 2014 Subsequent Event [Member]	May 09, 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		623,700,000
Common stock repurchased, shares		149	2,468	300	41,100
Common stock repurchased, average price per share		$ 148.18	$ 92.35	$ 145.55	$ 83.35
Common stock repurchased, value		$ 22,065,000	$ 227,893,000	$ 48,500,000	$ 3,400,000,000