XML 65 R116.htm IDEA: XBRL DOCUMENT

Postretirement Benefits (Details 3)	12 Months Ended
Postretirement Benefits (Details 3)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Weighted average discount rates:
Used to determine benefit obligations at December 31	4.00%	4.25%	5.25%
Used to determine net periodic postretirement benefit cost for years ended December 31	4.25%	5.25%	5.70%
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year	8.00%	7.50%	8.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	4.00%	4.00%
Year that rate reaches ultimate trend rate	2019	2019	2019

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.

+ References+ Details