Weighted-Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Weighted-Average Assumptions Used to Determine Benefit Obligation [Abstract]
Rate of Compensation Increase		4.3 - 4.6%		4.3 - 4.6%
Trend Rate		10.00%		10.00%
Ultimate Trend Rate		5.00%		5.00%
Year Ultimate Trend Rate Effective		2018		2018
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Costs [Abstract]
Discount Rate (Range)		5.36 - 5.40%
Discount Rate				5.81%		6.12%
Rate of Compensation Increase		4.3 - 4.6%		4.3 - 4.6%		4.3 - 4.6%
Revised Expected Long-term Rate of Return	8.25%
Pension [Member]
Weighted-Average Assumptions Used to Determine Benefit Obligation [Abstract]
Discount Rate		4.54%		5.36%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Costs [Abstract]
Revised Expected Long-term Rate of Return		8.50%	[1]	8.50%	[1]	8.50%	[1]
Postretirement Health and Life [Member]
Weighted-Average Assumptions Used to Determine Benefit Obligation [Abstract]
Discount Rate		4.56%		5.40%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Costs [Abstract]
Expected Long-Term Return on Plan Assets		6.8 - 8.5%	[1]	6.8 - 8.5%	[1]	6.8 - 8.5%	[1]

[1] (a) The expected long-term rate of return used to determine net periodic benefit expenses for 2012 has been reduced to 8.25 percent.