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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Long-term debt
Derivative [Line Items]
Contractual Rates	3.34%	4.13%	3.49%	4.01%
Rate Including Impact of Hedges	2.67%	3.20%	2.77%	3.20%