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Commitments and Contingencies (Table)
12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]  
Accrual For Environmental Loss Contingencies [Table Text Block]
                      
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
Balance at December 31, 2009$ 65 $ 13 $ 42 $ 13 $ 29 $ 20 $ 15
Provisions / adjustments  37     21   3   18   39   (2)
Cash reductions  (14)     (28)   (4)   (24)   (9)   (2)
Balance at December 31, 2010  88   13   35   12   23   50   11
Provisions / adjustments  6     10   1   9   5   1
Cash reductions  (33)   (1)   (22)   (2)   (20)   (27)   (3)
Balance at December 31, 2011  61   12   23   11   12   28   9
Provisions / adjustments  39   1   19   5   14   5   3
Cash reductions  (25)   (1)   (9)   (2)   (7)   (18)   (4)
Balance at December 31, 2012$ 75 $ 12 $ 33 $ 14 $ 19 $ 15 $ 8
                      
Schedule of additional possible losses in excess of recorded environmental reserves [Table Text Block]
       
(in millions)   
Duke Energy   $ 92
Duke Energy Carolinas     28
Progress Energy     7
Progress Energy Carolinas     3
Progress Energy Florida     4
Duke Energy Ohio     51
Duke Energy Indiana     5
       
Estimated costs of complying with recently issued and proposed EPA regulations [Table Text Block]
        
(in millions)    
Duke Energy$ 650 to$ 800
Duke Energy Carolinas  65 to  85
Progress Energy  7 to  30
Progress Energy Carolinas  5 to  10
Progress Energy Florida  2 to  20
Duke Energy Ohio  40 to  85
Duke Energy Indiana  540 to  600
        
Schedule of Litigation Reserves and Related Insurance Recoveries [Table Text Block]
  Years Ended December 31,
(in millions)2012 2011
Reserves for Legal and Other Matters(a)     
Duke Energy(b)$ 846 $ 810
Duke Energy Carolinas(b)  751   801
Progress Energy  79   83
Progress Energy Carolinas  12   11
Progress Energy Florida(c)  47   51
Duke Energy Indiana  8   4
Probable Insurance Recoveries(d)     
Duke Energy(e)$ 781 $ 813
Duke Energy Carolinas(e)  781   813
       
(a)Reserves are classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.
(b)Includes reserves for aforementioned asbestos-related injuries and damages claims.
(c)Includes workers' compensation claims.
(d)Insurance recoveries are classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.
       
Schedule of Purchase Obligations
                      
(in millions)2013 2014 2015 2016 2017 Thereafter Total
Duke Energy(a)$ 68 $ 19 $ 5 $ 3 $ 2 $ 18 $ 115
Progress Energy(a)  68   19   5   3   2   18   115
Progress Energy Florida(a)  68   19   5   3   2   18   115
                      
(a)Represents estimated amounts for Progress Energy Florida's obligations primarily related to selected components of long lead time equipment at Levy as discussed under "Other Purchase Obligations."
Schedule of Rent Expense [Table Text Block]
  For the Years Ended December 31,
(in millions)201220112010
Duke Energy $ 232 $ 104 $ 122
Duke Energy Carolinas   38   43   60
Progress Energy   232   104   100
Progress Energy Carolinas   164   88   63
Progress Energy Florida   68   15   37
Duke Energy Ohio   14   19   19
Duke Energy Indiana   20   24   24
           
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
                      
 The following table presents future minimum lease payments under operating leases, which at inception had a non-cancelable
term of more than one year, as of December 31, 2012.
                      
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 171 $ 35 $ 91 $ 47 $ 38 $ 11 $ 19
2014  156   28   88   46   37   10   15
2015  139   21   86   46   37   8   12
2016  127   16   85   46   36   7   9
2017  108   14   71   35   36   6   6
Thereafter  981   77   721   431   290   24   7
Total$ 1,682 $ 191 $ 1,142 $ 651 $ 474 $ 66 $ 68
                      
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
                      
 The following table presents future minimum lease payments under capital leases as of December 31, 2012.
                      
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 210 $ 7 $ 47 $ 21 $ 26 $ 10 $ 5
2014  180   7   46   20   26   9   5
2015  181   7   46   20   26   7   4
2016  183   8   45   19   26   6   4
2017  180   8   45   20   25   3   1
Thereafter  1,779   65   579   325   254   5   35
Minimum annual payments  2,713   102   808   425   383   40   54
Less amount representing interest  (1,024)   (70)   (469)   (275)   (194)   (5)   (31)
Total$ 1,689 $ 32 $ 339 $ 150 $ 189 $ 35 $ 23
                      
Duke Energy Carolinas [Member]
 
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Litigation Reserves and Related Insurance Recoveries [Table Text Block]
  Years Ended December 31,
(in millions)2012 2011
Reserves for Legal and Other Matters(a)     
Duke Energy(b)$ 846 $ 810
Duke Energy Carolinas(b)  751   801
Progress Energy  79   83
Progress Energy Carolinas  12   11
Progress Energy Florida(c)  47   51
Duke Energy Indiana  8   4
Probable Insurance Recoveries(d)     
Duke Energy(e)$ 781 $ 813
Duke Energy Carolinas(e)  781   813
       
(a)Reserves are classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.
(b)Includes reserves for aforementioned asbestos-related injuries and damages claims.
(c)Includes workers' compensation claims.
(d)Insurance recoveries are classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.
       
Progress Energy [Member]
 
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Litigation Reserves and Related Insurance Recoveries [Table Text Block]
  Years Ended December 31,
(in millions)2012 2011
Reserves for Legal and Other Matters(a)     
Duke Energy(b)$ 846 $ 810
Duke Energy Carolinas(b)  751   801
Progress Energy  79   83
Progress Energy Carolinas  12   11
Progress Energy Florida(c)  47   51
Duke Energy Indiana  8   4
Probable Insurance Recoveries(d)     
Duke Energy(e)$ 781 $ 813
Duke Energy Carolinas(e)  781   813
       
(a)Reserves are classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.
(b)Includes reserves for aforementioned asbestos-related injuries and damages claims.
(c)Includes workers' compensation claims.
(d)Insurance recoveries are classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.
       
Schedule of Purchase Obligations
                      
(in millions)2013 2014 2015 2016 2017 Thereafter Total
Duke Energy(a)$ 68 $ 19 $ 5 $ 3 $ 2 $ 18 $ 115
Progress Energy(a)  68   19   5   3   2   18   115
Progress Energy Florida(a)  68   19   5   3   2   18   115
                      
(a)Represents estimated amounts for Progress Energy Florida's obligations primarily related to selected components of long lead time equipment at Levy as discussed under "Other Purchase Obligations."
Progress Energy Carolinas [Member]
 
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Litigation Reserves and Related Insurance Recoveries [Table Text Block]
  Years Ended December 31,
(in millions)2012 2011
Reserves for Legal and Other Matters(a)     
Duke Energy(b)$ 846 $ 810
Duke Energy Carolinas(b)  751   801
Progress Energy  79   83
Progress Energy Carolinas  12   11
Progress Energy Florida(c)  47   51
Duke Energy Indiana  8   4
Probable Insurance Recoveries(d)     
Duke Energy(e)$ 781 $ 813
Duke Energy Carolinas(e)  781   813
       
(a)Reserves are classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.
(b)Includes reserves for aforementioned asbestos-related injuries and damages claims.
(c)Includes workers' compensation claims.
(d)Insurance recoveries are classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.
       
Progress Energy Florida [Member]
 
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Litigation Reserves and Related Insurance Recoveries [Table Text Block]
  Years Ended December 31,
(in millions)2012 2011
Reserves for Legal and Other Matters(a)     
Duke Energy(b)$ 846 $ 810
Duke Energy Carolinas(b)  751   801
Progress Energy  79   83
Progress Energy Carolinas  12   11
Progress Energy Florida(c)  47   51
Duke Energy Indiana  8   4
Probable Insurance Recoveries(d)     
Duke Energy(e)$ 781 $ 813
Duke Energy Carolinas(e)  781   813
       
(a)Reserves are classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.
(b)Includes reserves for aforementioned asbestos-related injuries and damages claims.
(c)Includes workers' compensation claims.
(d)Insurance recoveries are classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.
       
Schedule of Purchase Obligations
                      
(in millions)2013 2014 2015 2016 2017 Thereafter Total
Duke Energy(a)$ 68 $ 19 $ 5 $ 3 $ 2 $ 18 $ 115
Progress Energy(a)  68   19   5   3   2   18   115
Progress Energy Florida(a)  68   19   5   3   2   18   115
                      
(a)Represents estimated amounts for Progress Energy Florida's obligations primarily related to selected components of long lead time equipment at Levy as discussed under "Other Purchase Obligations."
Duke Energy Indiana [Member]
 
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Litigation Reserves and Related Insurance Recoveries [Table Text Block]
  Years Ended December 31,
(in millions)2012 2011
Reserves for Legal and Other Matters(a)     
Duke Energy(b)$ 846 $ 810
Duke Energy Carolinas(b)  751   801
Progress Energy  79   83
Progress Energy Carolinas  12   11
Progress Energy Florida(c)  47   51
Duke Energy Indiana  8   4
Probable Insurance Recoveries(d)     
Duke Energy(e)$ 781 $ 813
Duke Energy Carolinas(e)  781   813
       
(a)Reserves are classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.
(b)Includes reserves for aforementioned asbestos-related injuries and damages claims.
(c)Includes workers' compensation claims.
(d)Insurance recoveries are classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.