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Organization and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2012
Disclosure Organization And Summary Of Significant Accounting Policies [Line Items]  
Schedule of Unbilled Revenues [Text Block]
 (in millions)September 30, 2012December 31, 2011 
 Progress Energy$190 $157 
 PEC$99 $102 
 PEF$91 $55 
        
PEC [Member]
  
Disclosure Organization And Summary Of Significant Accounting Policies [Line Items]  
Schedule of Unbilled Revenues [Text Block]
 (in millions)September 30, 2012December 31, 2011 
 Progress Energy$190 $157 
 PEC$99 $102 
 PEF$91 $55 
        
PEF [Member]
  
Disclosure Organization And Summary Of Significant Accounting Policies [Line Items]  
Schedule of Unbilled Revenues [Text Block]
 (in millions)September 30, 2012December 31, 2011 
 Progress Energy$190 $157 
 PEC$99 $102 
 PEF$91 $55