Benefit Plans (Schedule of Assumptions Used) (Details)		12 Months Ended												12 Months Ended			3 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2011 Pension Benefits [Member]	Dec. 31, 2010 Pension Benefits [Member]	Dec. 31, 2012 Pension Benefits [Member] Minimum [Member]	Dec. 31, 2011 Pension Benefits [Member] Minimum [Member]	Dec. 31, 2010 Pension Benefits [Member] Minimum [Member]	Dec. 31, 2012 Pension Benefits [Member] Maximum [Member]	Dec. 31, 2011 Pension Benefits [Member] Maximum [Member]	Dec. 31, 2010 Pension Benefits [Member] Maximum [Member]	Dec. 31, 2012 Postretirement Benefits [Member]	Dec. 31, 2011 Postretirement Benefits [Member]	Dec. 31, 2010 Postretirement Benefits [Member]	Dec. 31, 2012 Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2011 Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2012 Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2011 Medical Trend Rates, Non-Medicare Risk, After Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2012 Prescription Drugs [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2011 Prescription Drugs [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Prescription Drugs [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Prescription Drugs [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2012 Prescription Drugs [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2011 Prescription Drugs [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2012 Medical Trend Rates, Medicare Risk HMO, After Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2011 Medical Trend Rates, Medicare Risk HMO, After Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Medical Trend Rates, Medicare Risk HMO, After Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Medical Trend Rates, Medicare Risk HMO, After Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2012 Medical Trend Rates, Medicare Risk HMO, After Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2011 Medical Trend Rates, Medicare Risk HMO, After Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2012 Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2011 Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent [Member] Postretirement Benefits [Member] Minimum [Member]	Dec. 31, 2010 Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2012 Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]	Dec. 31, 2011 Medical Trend Rates, Non-Medicare Risk, Under Age 65, Percent [Member] Postretirement Benefits [Member] Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		5.22%			3.75%	3.75%	3.75%	5.22%	5.22%	5.22%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.21%	4.21%	5.04%	5.60%							3.18%	4.23%	4.43%
Long-term rate of return on assets		7.00%	7.25%	8.25%
Medical trend rates														5.00%	5.00%	5.00%	13.00%	12.00%	12.50%	5.00%	5.00%	5.00%	9.00%	8.00%	8.50%	5.00%	5.00%	5.00%	13.00%	12.00%	12.50%	5.00%	5.00%	5.00%	9.00%	8.00%	8.50%