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Retirement and Employee Benefit Plans (Measurement Purposes Following Trend Rates were Assumed) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Retirement and Employee Benefit Plans [Abstract]
Health care cost trend assumed for next year	8.00%	9.00%
Rate to which the cost trend is assumed to decline	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2031	2031

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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