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Pension and Other Post-Retirement Benefits Assumed Health Care Trend Rates (Details)	12 Months Ended
	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Medical [Member]
Assumed Health Care Trend Rates [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	10.00%	10.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Year That the Rate Reaches the Ultimate Trend Rate	2023	2022
Dental [Member]
Assumed Health Care Trend Rates [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	10.00%	10.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Year That the Rate Reaches the Ultimate Trend Rate	2023	2022

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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