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Pension and Other Employee Benefits (Details 2) (Other Benefits)		12 Months Ended
	Jan. 31, 2012 Minimum bond	Dec. 31, 2011 Pre-65	Dec. 31, 2010 Pre-65	Dec. 31, 2009 Pre-65	Dec. 31, 2011 Post-65	Dec. 31, 2010 Post-65	Dec. 31, 2009 Post-65
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year (as a percent)		8.00%	7.50%	8.00%	8.00%	7.50%	8.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent)		5.00%	5.00%	5.00%	5.00%	5.00%	5.00%
Outstanding bonds with significant issues	100,000

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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