Derivative Financial Instruments (Contractual And Weighted-Average Interest Rates, Which Include The Effects Of Hedges Related To Financial Instruments) (Details) (Long-term debt)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Long-term debt
Derivative [Line Items]
Contractual Rates	3.77%	3.93%
Rate Including Impact of Hedges	3.03%	3.23%