Derivative Financial Instruments (Contractual And Weighted-Average Interest Rates, Which Include The Effects Of Hedges Related To Financial Instruments) (Details) (Long-Term Debt [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Long-Term Debt [Member]
Derivative [Line Items]
Contractual Rates	4.13%	3.58%	4.01%	3.56%
Rate Including Impact of Hedges	3.20%	3.17%	3.20%	3.17%