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Employee Benefit Plans (Schedule of Assumed Health Care Cost Trend Rates for the Next Year) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Rate to which the cost trend rate is assumed to decline (the ultimate trand rate)	5.00%	5.00%
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate assumed for next year	7.50%	8.30%
Year that the rate reaches the ultimate trend rate	2018	2021
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate assumed for next year	14.30%	15.50%
Year that the rate reaches the ultimate trend rate	2023	2021

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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