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Risk Management, Derivative Instruments and Hedging Activities (Tables)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]      
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,140 $ ― $ ― $ ― $ ―
Undesignated contracts(b)   585   ―   ―   27   200
Total notional amount $ 1,725 $ ― $ ― $ 27 $ 200
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   290   50   50   27   200
Fair value hedges   250   ―   ―   250   ―
Total notional amount $ 1,587 $ 50 $ 50 $ 277 $ 200
                 
Underlying Notional Amounts for Commodity Derivative Instruments Accounted for at Fair Value  
  June 30, 2013
  Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Electricity-energy (Gigawatt-hours)(a) 67,124  1,634  1,546  1,546  ―  64,599  815
Natural gas (millions of decatherms) 543  ―  346  129  217  197  ―
               
  December 31, 2012
  Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Electricity-energy (Gigawatt-hours)(a) 52,104  2,028  1,850  1,850  ―  51,215  97
Natural gas (millions of decatherms) 528  ―  348  118  230  180  ―
               
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets  
             
  June 30, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Commodity contracts           
Current liabilities: other$ ― $ 1 $ ― $ 2
Deferred credits and other liabilities: other  ―   3   ―   1
Interest rate contracts           
Current assets: other  ―   ―   2   ―
Investments and other assets: other  10   ―   7   ―
Current Liabilities: Other  ―   50   ―   81
Deferred credits and other liabilities: other  12   13   ―   35
Total Derivatives Designated as Hedging Instruments  22   67   9   119
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current assets: other  50   2   41   2
Investments and other assets: other  137   93   106   50
Current liabilities: other  156   404   106   407
Deferred credits and other liabilities: other  4   208   2   255
Interest rate contracts            
Current liabilities: other  ―   37   ―   76
Deferred credits and other liabilities: other  ―   5   ―   8
Total Derivatives Not Designated as Hedging Instruments  347   749   255   798
Total Derivatives$ 369 $ 816 $ 264 $ 917
             
  
Offsetting Assets and Liabilities  
  June 30, 2013
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 183 $ 143  $369 $ 287 
Gross amounts offset  (157)   (99)    (177)   (118) 
Net amount subject to master netting  26   44    192   169 
Amounts not subject to master netting  22   21   123   37 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 48 (a)$ 65 (b) $ 315 (c)$ 206 (d)
               
  December 31, 2012
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 127 $ 96  $402 $ 295 
Gross amounts offset  (114)   (54)    (151)   (90) 
Net amounts subject to master netting  13   42    251   205 
Amounts not subject to master netting  22   19   166   54 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 35 (a)$ 61 (b) $ 417 (c)$ 259 (d)
               
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
  Three Months Ended June 30,
(in millions)2013 2012
Pretax Gains (Losses) Recorded in AOCI      
Interest rate contracts $ 58 $ (44)
Commodity contracts   ―   ―
Total Pretax Gains (Losses) Recorded in AOCI $ 58 $ (44)
Location of Pretax Losses Reclassified from AOCI into Earnings(a)      
Interest rate contracts(b)      
Interest expense $ ― $ (1)
Total Pretax Losses Reclassified from AOCI into Earnings $ ― $ (1)
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Pretax Gains (Losses) Recorded in AOCI      
Interest rate contracts $ 71 $ (26)
Commodity contracts   1   ―
Total Pretax Gains (Losses) Recorded in AOCI $ 72 $ (26)
Location of Pretax Losses Reclassified from AOCI into Earnings(a)      
Interest rate contracts(b)      
Interest expense $ (1) $ (2)
Total Pretax Losses Reclassified from AOCI into Earnings $ (1) $ (2)
        
(a)Represents the gains and losses on cash flow hedges previously recorded in AOCI during the term of the hedging relationship and reclassified into earnings during the current period.
(b)Amounts in AOCI related to terminated hedges are reclassified to earnings as the interest expense is recorded. The effective portion of the hedges will be amortized to interest expense over the term of the related debt.
        
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
        
  Three Months Ended June 30,
(in millions)  2013  2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, regulated electric $ 1 $ ―
Revenue, nonregulated electric, natural gas and other   74   ―
Fuel used in electric generation and purchased power regulated   (37)   ―
Fuel used in electric generation and purchased power - nonregulated   (11)   ―
Interest rate contracts      
Interest expense   (5)   ―
Total Pretax Losses Recognized in Earnings $ 22 $ ―
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts      
Regulatory asset $ (110) $ 1
Regulatory liability   9   17
Interest rate contracts      
Regulatory asset   26   (32)
Total Pretax Losses Recognized as Regulatory Assets of Liabilities $ (75) $ (14)
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, regulated electric $ 7 $ ―
Revenue, nonregulated electric, natural gas and other   (8)   36
Fuel used in electric generation and purchased power regulated   (89)   ―
Fuel used in electric generation and purchased power - nonregulated   (18)   ―
Interest rate contracts      
Interest expense   (9)   ―
Total Pretax (Losses) Gains Recognized in Earnings $ (117) $ 36
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts      
Regulatory asset $ (5) $ ―
Regulatory liability   4   22
Interest rate contracts      
Regulatory asset   39   (10)
Total Pretax Gains Recognized as Regulatory Assets of Liabilities $ 38 $ 12
        
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 532 $ 261 $ 97 $ 164 $ 268
Fair value of collateral already posted   158   32   4   28   126
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   246   229   93   136   17
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 466 $ 286 $ 108 $ 178 $ 176
Fair value of collateral already posted   163   59   9   50   104
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   230   227   99   128   2
                 
Schedule Of Cash Collateral Under Master Netting Arrangements  
             
  June 30, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 39 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  129   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  32   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  4   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  28   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  5   ―   15   ―
Amounts not offset against net derivative positions  120   ―   92   ―
Duke Energy Indiana           
Amounts offset against net derivative positions  2   ―   ―   ―
Amounts not offset against net derivative positions  9   ―   ―   ―
             
  
Duke Energy Carolinas [Member]
      
Derivative [Line Items]      
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets  
             
  June 30, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current liabilities: other$ ― $ 3 $ ― $ 6
Deferred credits and other liabilities: other  ―   1   ―   6
Total Derivatives Not Designated as Hedging Instruments  ―   4   ―   12
Total Derivatives$ ― $ 4 $ ― $ 12
             
(a)Substantially all of these contracts receive regulatory accounting treatment.
  
Offsetting Assets and Liabilities  
  June 30, 2013
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ ― $ ―  $ ― $ ― 
Gross amounts offset  ―   ―    ―   ― 
Net amount subject to master netting  ―   ―    ―   ― 
Amounts not subject to master netting  ―   ―    3   1 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ ― $ ―  $ 3 (a)$ 1 (b)
               
  December 31, 2012
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ ― $ ―  $ ― $ ― 
Gross amounts offset  ―   ―    ―   ― 
Net amount subject to master netting  ―   ―    ―   ― 
Amounts not subject to master netting  ―   ―    6   6 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ ― $ ―  $ 6 (a)$ 6 (b)
               
Progress Energy [Member]
      
Derivative [Line Items]      
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk    
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   290   50   50   27   200
Fair value hedges   250   ―   ―   250   ―
Total notional amount $ 1,587 $ 50 $ 50 $ 277 $ 200
                 
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets  
             
  June 30, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments            
Commodity contracts            
Current liabilities: other$ ― $ 1 $ ― $ 2
Deferred credits and other liabilities: other  ―   1   ―   1
Total Derivatives Designated as Hedging Instruments  ―   2   ―   3
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current assets: other  ―   ―   3   ―
Investments and other assets: other  ―   ―   8   ―
Current liabilities: other  4   175   ―   231
Deferred credits and other liabilities: other  2   154   ―   195
Interest rate contracts            
Current liabilities: other  ―   ―   ―   11
Total Derivatives Not Designated as Hedging Instruments  6   329   11   437
Total Derivatives$ 6 $ 331 $ 11 $ 440
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Offsetting Assets and Liabilities  
  June 30, 2013
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 4 $ 2  $176 $ 151 
Gross amounts offset  (4)   (2)    (17)   (21) 
Net amount subject to master netting  ―   ―    159   130 
Amounts not subject to master netting  ―   ―    ―   4 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ ― (a)$ ― (b) $ 159 (c)$ 134 (d)
               
  December 31, 2012
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 3 $ 8  $244 $ 192 
Gross amounts offset  ―   ―    (22)   (36) 
Net amount subject to master netting  3   8    222   156 
Amounts not subject to master netting  ―   ―    ―   4 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 3 (a)$ 8 (b) $ 222 (c)$ 160 (d)
               
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
  Three Months Ended June 30,
(in millions)2013 2012
Pretax Losses Recorded in AOCI      
Interest rate contracts $ ― $ (14)
Total Pretax Losses Recorded in AOCI $ ― $ (14)
Location of Pretax Losses Reclassified from AOCI into Earnings(a)      
Interest rate contracts(b)      
Interest expense $ ― $ (6)
Total Pretax Losses Reclassified from AOCI into Earnings $ ― $ (6)
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Pretax Gains (Losses) Recorded in AOCI      
Interest rate contracts $ ― $ (10)
Commodity contracts   1   ―
Total Pretax Gains (Losses) Recorded in AOCI $ 1 $ (10)
Location of Pretax Losses Reclassified from AOCI into Earnings(a)      
Interest rate contracts(b)      
Interest expense $ ― $ (10)
Total Pretax Losses Reclassified from AOCI into Earnings $ ― $ (10)
        
(a)Represents the gains and losses on cash flow hedges previously recorded in AOCI during the term of the hedging relationships and reclassified into earnings during the current period.
(b)Amounts in AOCI related to terminated hedges are reclassified to earnings as the interest expense is recorded. The effective portion of the hedges will be amortized to interest expense over the term of the related debt.
        
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
        
  Three Months Ended June 30,
(in millions)  2013  2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, regulated electric $ 1 $ ―
Fuel used in electric generation and purchased power - regulated(a)   (37)   (155)
Other income and expenses, net   ―   3
Interest rate contracts      
Interest expense   (5)   ―
Total Pretax Losses Recognized in Earnings $ (41) $ (152)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(b)      
Regulatory asset $ (108) $ 38
Regulatory liability   ―   ―
Interest rate contracts(c)      
Regulatory asset   4   ―
Total Pretax (Losses) Gains Recognized as Regulatory Assets of Liabilities $ (104) $ 38
        
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, regulated electric $ 7 $ ―
Fuel used in electric generation and purchased power - regulated(a)   (89)   (260)
Other income and expenses, net   ―   11
Interest rate contracts      
Interest expense   (9)   ―
Total Pretax Losses Recognized in Earnings $ (91) $ (249)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(b)      
Regulatory asset $ (3) $ (168)
Interest rate contracts(c)      
Regulatory asset   9   ―
Total Pretax Gains (Losses) Recognized as Regulatory Assets of Liabilities $ 6 $ (168)
        
(a)After the derivatives are settled and the fuel is consumed, gains or losses are passed through the fuel cost-recovery clause.
(b)Amounts are recorded as regulatory assets and liabilities in the Condensed Consolidated Balance Sheets until gains or losses are passed through the fuel cost-recovery clause.
(c)Amounts in regulatory assets and liabilities related to terminated hedges are reclassified to earnings as the interest expense is recorded. The hedges will be amortized to interest expense over the term of the related debt.
        
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 532 $ 261 $ 97 $ 164 $ 268
Fair value of collateral already posted   158   32   4   28   126
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   246   229   93   136   17
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 466 $ 286 $ 108 $ 178 $ 176
Fair value of collateral already posted   163   59   9   50   104
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   230   227   99   128   2
                 
Schedule Of Cash Collateral Under Master Netting Arrangements  
             
  June 30, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 39 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  129   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  32   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  4   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  28   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  5   ―   15   ―
Amounts not offset against net derivative positions  120   ―   92   ―
Duke Energy Indiana           
Amounts offset against net derivative positions  2   ―   ―   ―
Amounts not offset against net derivative positions  9   ―   ―   ―
             
  
Duke Energy Progress [Member]
      
Derivative [Line Items]      
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk    
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   290   50   50   27   200
Fair value hedges   250   ―   ―   250   ―
Total notional amount $ 1,587 $ 50 $ 50 $ 277 $ 200
                 
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets  
             
  June 30, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Commodity contracts           
Current liabilities: other$ ― $ 1 $ ― $ 1
Deferred credits and other liabilities: other  ―   1   ―   1
Total Derivatives Designated as Hedging Instruments  ―   2   ―   2
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current assets: other  ―   ―   1   ―
Investments and other assets: other  ―   ―   1   ―
Current liabilities: other  1   67   ―   85
Deferred credits and other liabilities: other  ―   56   ―   68
Interest rate contracts            
Current liabilities: other  ―   ―   ―   11
Total Derivatives Not Designated as Hedging Instruments  1   123   2   164
Total Derivatives$ 1 $ 125 $ 2 $ 166
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Offsetting Assets and Liabilities  
  June 30, 2013
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 1 $ ―  $68 $ 57 
Gross amounts offset  (1)   ―    (2)   (3) 
Net amount subject to master netting  ―   ―    66   54 
Amounts not subject to master netting  ―   ―    ―   ― 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ ― (a)$ ― (b) $ 66 (c)$ 54 (d)
               
  December 31, 2012
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 1 $ 1  $97 $ 69 
Gross amounts offset  ―   ―    (2)   (7) 
Net amount subject to master netting  1   1    95   62 
Amounts not subject to master netting  ―   ―    ―   ― 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 1 (a)$ 1 (b) $ 95 (c)$ 62 (d)
               
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
  Three Months Ended June 30,
(in millions)2013 2012
Pretax Gains and (Losses) Recorded in AOCI      
Interest rate contracts(b) $ ― $ (12)
Total Pretax Losses Recorded in AOCI $ ― $ (12)
Location of Pretax Gains and (Losses) Reclassified from AOCI into Earnings(a)      
Interest rate contracts(b)      
Interest expense $ ― $ (2)
Total Pretax Losses Reclassified from AOCI into Earnings $ ― $ (2)
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Pretax Gains and (Losses) Recorded in AOCI      
Interest rate contracts(b) $ ― $ (7)
Total Pretax Losses Recorded in AOCI $ ― $ (7)
Location of Pretax Gains and (Losses) Reclassified from AOCI into Earnings(a)      
Interest rate contracts      
Interest expense $ ― $ (5)
Total Pretax Losses Reclassified from AOCI into Earnings $ ― $ (5)
        
(a)Represents the gains and losses on cash flow hedges previously recorded in AOCI during the term of the hedging relationships and reclassified into earnings during the current period.
(b)Amounts in AOCI related to terminated hedges are reclassified to earnings as the interest expense is recorded. The effective portion of the hedges will be amortized to interest expense over the term of the related debt.
        
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
        
  Three Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, regulated electric $ 1 $ ―
Fuel used in electric generation and purchased power -regulated(a)   (12)   (39)
Other income and expenses, net   ―   3
Interest rate contracts      
Interest expense   (3)   ―
Total Pretax Losses Recognized in Earnings $ (14) $ (36)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(b)      
Regulatory asset $ (43) $ 10
Interest rate contracts(c)      
Regulatory asset   4   ―
Total Pretax (Losses) Gains Recognized as Regulatory Assets of Liabilities $ (39) $ 10
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, regulated electric $ 7 $ ―
Fuel used in electric generation and purchased power - regulated(a)   (29)   (65)
Other income and expenses, net      3
Interest rate contracts      
Interest expense   (6)   ―
Total Pretax Losses Recognized in Earnings $ (28) $ (62)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(b)      
Regulatory asset $ (7) $ (49)
Interest rate contracts(c)      
Regulatory asset   7   ―
Total Pretax Losses Recognized as Regulatory Assets of Liabilities $ ― $ (49)
        
(a)After the derivatives are settled and the fuel is consumed, gains or losses are passed through the fuel cost-recovery clause.
(b)Amounts are recorded in regulatory assets and liabilities in the Condensed Consolidated Balance Sheets until gains or losses are passed through the fuel cost-recovery clause.
(c)Amounts in regulatory assets and liabilities related to terminated hedges are reclassified to earnings as the interest expense is recorded. The hedges will be amortized to interest expense over the term of the related debt.
        
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 532 $ 261 $ 97 $ 164 $ 268
Fair value of collateral already posted   158   32   4   28   126
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   246   229   93   136   17
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 466 $ 286 $ 108 $ 178 $ 176
Fair value of collateral already posted   163   59   9   50   104
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   230   227   99   128   2
                 
Schedule Of Cash Collateral Under Master Netting Arrangements  
             
  June 30, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 39 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  129   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  32   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  4   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  28   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  5   ―   15   ―
Amounts not offset against net derivative positions  120   ―   92   ―
Duke Energy Indiana           
Amounts offset against net derivative positions  2   ―   ―   ―
Amounts not offset against net derivative positions  9   ―   ―   ―
             
  
Duke Energy Florida [Member]
      
Derivative [Line Items]      
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets  
             
  June 30, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments            
Commodity contracts           
Current liabilities: other$ ― $ 1 $ ― $ 1
Total Derivatives Designated as Hedging Instruments  ―   1   ―   1
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current Assets: Other  ―   ―   2   ―
Investments and Other Assets: Other  ―   ―   7   ―
Current liabilities: other  3   107   ―   146
Deferred credits and other liabilities: other  2   94   ―   123
Total Derivatives Not Designated as Hedging Instruments  5   201   9   269
Total Derivatives$ 5 $ 202 $ 9 $ 270
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Offsetting Assets and Liabilities  
  June 30, 2013
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 3 $ 2  $108 $ 94 
Gross amounts offset  (3)   (2)    (15)   (18) 
Net amount subject to master netting  ―   ―    93   76 
Amounts not subject to master netting  ―   ―    ―   ― 
Net amounts recognized on the Condensed Balance Sheet$ ― (a)$ ― (b) $ 93 (c)$ 76 (d)
               
  December 31, 2012
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 2 $ 7  $147 $ 123 
Gross amounts offset  ―   ―    (20)   (29) 
Net amount subject to master netting  2   7    127   94 
Amounts not subject to master netting  ―   ―    ―   ― 
Net amounts recognized on the Condensed Balance Sheet$ 2 (a)$ 7 (b) $ 127 (c)$ 94 (d)
               
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
        
  Three Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Fuel used in electric generation and purchased power - regulated(a) $ (25) $ (116)
Interest rate contracts      
Interest expense   (1)   ―
Total Pretax Losses Recognized in Earnings $ (26) $ (116)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(b)      
Regulatory asset $ (66) $ 28
Interest rate contracts      
Regulatory asset   1   ―
Total Pretax (Losses) Gains Recognized as Regulatory Assets of Liabilities $ (65) $ 28
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Fuel used in electric generation and purchased power - regulated(a) $ (60) $ (195)
Interest rate contracts      
Interest expense   (2)   ―
Total Pretax Losses Recognized in Earnings $ (62) $ (195)
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(b)      
Regulatory asset $ 3 $ (119)
Interest rate contracts      
Regulatory asset   2   ―
Total Pretax Gains (Losses) Recognized as Regulatory Assets of Liabilities $ 5 $ (119)
        
(a)After the derivatives are settled and the fuel is consumed, gains or losses are passed through the fuel cost-recovery clause.
(b)Amounts are recorded in regulatory assets and liabilities in the Condensed Balance Sheets until gains or losses are passed through the fuel cost-recovery clause.
        
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 532 $ 261 $ 97 $ 164 $ 268
Fair value of collateral already posted   158   32   4   28   126
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   246   229   93   136   17
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 466 $ 286 $ 108 $ 178 $ 176
Fair value of collateral already posted   163   59   9   50   104
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   230   227   99   128   2
                 
Schedule Of Cash Collateral Under Master Netting Arrangements  
             
  June 30, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 39 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  129   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  32   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  4   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  28   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  5   ―   15   ―
Amounts not offset against net derivative positions  120   ―   92   ―
Duke Energy Indiana           
Amounts offset against net derivative positions  2   ―   ―   ―
Amounts not offset against net derivative positions  9   ―   ―   ―
             
  
Duke Energy Ohio [Member]
      
Derivative [Line Items]      
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,140 $ ― $ ― $ ― $ ―
Undesignated contracts(b)   585   ―   ―   27   200
Total notional amount $ 1,725 $ ― $ ― $ 27 $ 200
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   290   50   50   27   200
Fair value hedges   250   ―   ―   250   ―
Total notional amount $ 1,587 $ 50 $ 50 $ 277 $ 200
                 
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets  
             
  June 30, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Interest rate contracts           
Current assets: other$  $ ― $ 2 $ ―
Total Derivatives Designated as Hedging Instruments  ―   ―   2   ―
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current assets: other  27   8   31   4
Investments and other assets: other  129   93   81   51
Current liabilities: other  152   173   106   132
Deferred credits and other liabilities: other  1   20   ―   4
Interest rate contracts            
Current liabilities: other  ―   1   ―   1
Deferred credits and other liabilities: other  ―   5   ―   7
Total Derivatives Not Designated as Hedging Instruments  309   300   218   199
Total Derivatives$ 309 $ 300 $ 220 $ 199
  
Offsetting Assets and Liabilities  
  June 30, 2013
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 178 $ 131  $180 $ 114 
Gross amounts offset  (161)   (94)    (166)   (94) 
Net amount subject to master netting  17   37    14   20 
Amounts not subject to master netting  ―   ―    1   5 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 17 (a)$ 37 (b) $ 15 (c)$ 25 (d)
               
  December 31, 2012
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 137 $ 81  $136 $ 55 
Gross amounts offset  (110)   (51)    (125)   (51) 
Net amount subject to master netting  27   30    11   4 
Amounts not subject to master netting  2   ―    1   7 
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 29 (a)$ 30 (b) $ 12 (c)$ 11 (d)
               
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
        
  Three Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, nonregulated electric, natural gas and other $ 78 $ 4
Fuel used in electric generation and purchased power - nonregulated   (11)   ―
Interest rate contracts      
Interest expense   (1)   (1)
Total Pretax (Losses) Gains Recognized in Earnings $ 66 $ 3
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts      
Regulatory asset $ ― $ ―
Interest rate contracts      
Regulatory asset   2   (1)
Total Pretax Gains (Losses) Recognized as Regulatory Assets of Liabilities $ 2 $ (1)
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized in Earnings      
Commodity contracts      
Revenue, nonregulated electric, natural gas and other $ (13) $ 75
Fuel used in electric generation and purchased power - nonregulated   (18)   ―
Interest rate contracts      
Interest expense   (1)   (1)
Total Pretax (Losses) Gains Recognized in Earnings $ (32) $ 74
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts      
Regulatory asset $ ― $ (2)
Regulatory liability      1
Interest rate contracts      
Regulatory asset   3   ―
Total Pretax Gains (Losses) Recognized as Regulatory Assets of Liabilities $ 3 $ (1)
        
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 532 $ 261 $ 97 $ 164 $ 268
Fair value of collateral already posted   158   32   4   28   126
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   246   229   93   136   17
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 466 $ 286 $ 108 $ 178 $ 176
Fair value of collateral already posted   163   59   9   50   104
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   230   227   99   128   2
                 
Schedule Of Cash Collateral Under Master Netting Arrangements  
             
  June 30, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 39 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  129   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  32   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  4   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  28   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  5   ―   15   ―
Amounts not offset against net derivative positions  120   ―   92   ―
Duke Energy Indiana           
Amounts offset against net derivative positions  2   ―   ―   ―
Amounts not offset against net derivative positions  9   ―   ―   ―
             
  
Duke Energy Indiana [Member]
      
Derivative [Line Items]      
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk  
   June 30, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,140 $ ― $ ― $ ― $ ―
Undesignated contracts(b)   585   ―   ―   27   200
Total notional amount $ 1,725 $ ― $ ― $ 27 $ 200
                 
   December 31, 2012
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   290   50   50   27   200
Fair value hedges   250   ―   ―   250   ―
Total notional amount $ 1,587 $ 50 $ 50 $ 277 $ 200
                 
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets  
             
  June 30, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current assets: other$ 18 $ ― $ 10 $ ―
Current liabilities: other  ―   2   ―   ―
Interest rate contracts            
Current liabilities: other  ―   35   ―   63
Total Derivatives Not Designated as Hedging Instruments  18   37   10   63
Total Derivatives$ 18 $ 37 $ 10 $ 63
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Offsetting Assets and Liabilities  
  June 30, 2013
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Gross amounts recognized$ 18 $ ―  $ 2 $ ― 
Gross amounts offset  ―   ―    (2)   ― 
Net amount subject to master netting  18   ―    ―   ― 
Amounts not subject to master netting  ―       35    
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 18 (a)$ ―  $ 35 (b)$ ― 
               
  December 31, 2012
  Derivative Assets Derivative Liabilities
(in millions)Current Non-Current  Current Non-Current 
Amounts not subject to master netting  10       63    
Net amounts recognized on the Condensed Consolidated Balance Sheet$ 10 (a)$ ―  $ 63 (b)$ ― 
               
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
        
  Three Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(a)      
Regulatory asset $ (2) $ 2
Regulatory liability   ―   18
Interest rate contracts      
Regulatory asset   20   (30)
Total Pretax Gains Recognized as Regulatory Assets of Liabilities $ 18 $ (10)
        
        
  Six Months Ended June 30,
(in millions)2013 2012
Location of Pretax Gains and (Losses) Recognized as Regulatory Assets or Liabilities      
Commodity contracts(a)      
Regulatory asset $ (2) $ 2
Regulatory liability   4   22
Interest rate contracts      
Regulatory asset   28   (9)
Total Pretax Gains Recognized as Regulatory Assets of Liabilities $ 30 $ 15
        
(a)Amounts in regulatory assets and liabilities related to terminated hedges are reclassified to earnings as the interest expense is recorded. The hedges will be amortized to interest expense over the term of the related debt.
        
  
Schedule Of Cash Collateral Under Master Netting Arrangements  
             
  June 30, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 39 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  129   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  32   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  4   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  28   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  5   ―   15   ―
Amounts not offset against net derivative positions  120   ―   92   ―
Duke Energy Indiana           
Amounts offset against net derivative positions  2   ―   ―   ―
Amounts not offset against net derivative positions  9   ―   ―   ―