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Pensions And Other Postretirement Benefits (Assumed Health Care Cost Trend Rates) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Region Reporting Information, by Region [Line Items]
Ultimate health care cost trend rate	5.00%	5.00%
United States [Member]
Region Reporting Information, by Region [Line Items]
Health care cost trend rate assumed for next year	7.50%	8.00%
Year that the ultimate rate is reached	2017	2017
Canada [Member]
Region Reporting Information, by Region [Line Items]
Health care cost trend rate assumed for next year	8.00%	8.50%
Year that the ultimate rate is reached	2018	2018

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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