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, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Long-Term Debt [Member]
Contractual Rates	3.58%	3.72%	3.56%	3.73%
Rate Including Impact of Hedges	3.17%	3.33%	3.17%	3.28%