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		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Long-Term Debt [Member]
Derivative [Line Items]
Contractual Rates	3.98%	3.55%	3.95%	3.55%
Rate Including Impact of Hedges	3.14%	3.16%	3.19%	3.18%