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Employee Benefit Plans (Details 2) (Other Postretirement Benefits)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pre-65
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year (as a percent)	7.00%	7.50%	8.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent)	4.50%	5.00%	5.00%
Post-65
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year (as a percent)	7.00%	7.50%	8.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent)	4.50%	5.00%	5.00%

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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