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Discontinued Operations
12 Months Ended
Dec. 31, 2011
Discontinued Operations [Abstract]  
Discontinued Operations
22.  
DISCONTINUED OPERATIONS
 
On June 2, 2008, Great Plains Energy completed the sale of Strategic Energy, LLC, to Direct Energy Services, LLC, a subsidiary of Centrica plc.  In 2009, Great Plains Energy had a loss from discontinued operations of Strategic Energy before income taxes of $2.4 million and a loss net of income taxes of $1.5 million relating to gross receipt taxes for periods prior to the sale and the reversal of a reserve that had been established for certain indemnification obligations.