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Inventory (Tables)
12 Months Ended
Dec. 31, 2011
Inventory [Abstract]  
Inventory
   
   Progress Energy
(in millions) 2011  2010
Fuel for production$ 681 $ 542
Materials and supplies  747   676
Emission allowances  4   8
Other  6   -
 Total inventory$ 1,438 $ 1,226