Debt (Schedule Of Weighted Average Interest Rates) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Disclosure [Abstract]
Short-term debt	1.90%	2.50%	2.70%
Revolving credit facilities	3.50%	3.60%	2.60%