Derivative Financial Instruments (Contractual And Weighted-Average Interest Rates, Which Include The Effects Of Hedges Related To Financial Instruments) (Details) (Long-term debt [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Long-term debt [Member]
Derivative [Line Items]
Contractual Rates	4.01%	3.64%
Rate Including Impact of Hedges	3.17%	3.22%