Share Repurchase Program (Narrative) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended		38 Months Ended
	Feb. 05, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2014
Proceeds from (Repurchase of) Equity [Abstract]
Increase in authorized amount	$ 500,000,000	$ 500,000,000
Cumulative authorized amount	4,000,000,000	3,500,000,000
Authorization effective period	3 years	3 years
Common stock repurchased, shares		8,529	16,201	40,600
Common stock repurchased, average price per share		$ 109.38	$ 89.20	$ 82.61
Common stock repurchased, value		932,900,000	1,445,044,000	3,400,000,000
Remaining balance under share repurchase program		$ 145,700,000		$ 645,100,000