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Risk Management, Derivative Instruments And Hedging Activities (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Derivative [Line Items]    
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk
   March 31, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   238   ―   ―   27   200
Fair value hedges   250   ―   ―   250   ―
 Total notional amount $ 1,535 $ ― $ ― $ 277 $ 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
  March 31, 2013
  Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Commodity contracts              
Electricity-energy (Gigawatt-hours)(a) 56,890  1,802  1,850  1,850  ―  53,173  406
Natural gas (millions of decatherms) 516  ―  335  110  225  181  ―
               
  December, 31, 2012
  Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Commodity contracts             
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
              
  March 31, 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
Interest rate contracts            
Current assets: other  2   ―    2   ―
Investments and other assets: other  3   ―    7   ―
Current Liabilities: Other  (2)   70    ―   81
Deferred credits and other liabilities: other  ―   30    ―   35
Total Derivatives Designated as Hedging Instruments$ 3 $ 102  $ 9 $ 119
Derivatives Not Designated as Hedging Instruments            
Commodity contracts            
Current assets: other$ 52 $ 9  $ 41 $ 2
Investments and other assets: other  32   6    106   50
Current liabilities: other  151   372    106   407
Deferred credits and other liabilities: other  71   293    2   255
Interest rate contracts             
Current liabilities: other  ―   57    ―   76
Deferred credits and other liabilities: other  ―   6    ―   8
Total Derivatives Not Designated as Hedging Instruments$ 306 $ 743  $ 255 $ 798
Total Derivatives$ 309 $ 845  $ 264 $ 917
  
Offsetting Assets and Liabilities
   March 31, 2013
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 182 $ 157 $ 25 
Not Subject to Master Netting   21   ―   21 
Total Derivative Assets: Current   203   157   46 (a)
Derivative Assets: Non-current          
Subject to Master Netting   91   75   16 
Not Subject to Master Netting   15   ―   15 
Total Derivative Assets: Non-current   106   75   31 (b)
Derivative Liabilities: Current          
Subject to Master Netting   350   222   128 
Not Subject to Master Netting   159   ―   159 
Total Derivative Liabilities: Current   509   222   287 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   295   118   177 
Not Subject to Master Netting   41   ―   41 
Total Derivative Liabilities: Non-current   336   118   218 (d)
            
   December 31, 2012
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 127 $ 114 $ 13 
Not Subject to Master Netting   22   ―   22 
Total Derivative Assets: Current   149   114   35 (a)
Derivative Assets: Non-current          
Subject to Master Netting   96   54   42 
Not Subject to Master Netting   19   ―   19 
Total Derivative Assets: Non-current   115   54   61 (b)
Derivative Liabilities: Current          
Subject to Master Netting   402   151   251 
Not Subject to Master Netting   166   ―   166 
Total Derivative Liabilities: Current   568   151   417 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   295   90   205 
Not Subject to Master Netting   54   ―   54 
Total Derivative Liabilities: Non-current   349   90   259 (d)
            
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
  Three Months Ended March 31,
(in millions)2013 2012
Pre-tax Gains (Losses) Recorded in AOCI     
Interest rate contracts$ 13 $ 18
Commodity contracts  1   ―
Total Pre-tax Gains (Losses) Recorded in AOCI$ 14 $ 18
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)     
Interest rate contracts(b)     
Interest expense$ (1) $ (1)
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ (1) $ (1)
       
(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 March 31,
(in millions)2013 2012
Location of Pre-tax Gains and (Losses) Recognized in Earnings     
Commodity contracts     
Revenue, regulated electric$ 6 $ ―
Revenue, nonregulated electric, natural gas and other  (82)   36
Fuel used in electric generation and purchased power regulated  (52)   ―
Fuel used in electric generation and purchased power - nonregulated  (7)   ―
Interest rate contracts     
Interest expense  (4)   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (139) $ 36
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities     
Commodity contracts     
Regulatory asset$ 105 $ (1)
Regulatory liability  (5)   5
Interest rate contracts     
Regulatory asset  13   22
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 113 $ 26
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
   March 31, 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 $ 512 $ 230 $ 79 $ 151 $ 279
Collateral already posted   215   35   3   32   180
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   202   195   76   119   7
                 
   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
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
             
  March 31, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 107 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  108   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  35   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  3   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  32   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  72   ―   15   ―
Amounts not offset against net derivative positions$ 108 $ ― $ 92 $ ―
  
Duke Energy Carolinas [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
             
  March 31, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current liabilities: other$ ― $ 2 $ ― $ 6
Deferred credits and other liabilities: other  ―   3   ―   6
Total Derivatives Not Designated as Hedging Instruments$ ― $ 5 $ ― $ 12
Total Derivatives$ ― $ 5 $ ― $ 12
  
Offsetting Assets and Liabilities
   March 31, 2013
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Liabilities: Current          
Not Subject to Master Netting $ 2 $ ― $ 2 (a)
Derivative Liabilities: Non-current          
Not Subject to Master Netting   3   ―   3 (b)
            
   December 31, 2012
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Liabilities: Current          
Not Subject to Master Netting $ 6 $ ― $ 6 (a)
Derivative Liabilities: Non-current          
Not Subject to Master Netting   6   ―   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
             
  March 31, 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           
Current assets: other$ 13 $ ― $ 3 $ ―
Investments and other assets: other  2   ―   8   ―
Current liabilities: other  20   140   ―   231
Deferred credits and other liabilities: other  12   159   ―   195
Interest rate contracts            
Current liabilities: other  ―   ―   ―   11
Total Derivatives Not Designated as Hedging Instruments$ 47 $ 299 $ 11 $ 437
Total Derivatives$ 47 $ 301 $ 11 $ 440
  
Offsetting Assets and Liabilities
   March 31, 2013
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 33 $ 21 $ 12 (a)
Derivative Assets: Non-current          
Subject to Master Netting   14   12   2 (b)
Derivative Liabilities: Current          
Subject to Master Netting   141   34   107 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   156   34   122 
Not Subject to Master Netting   4   ―   4 
Total Derivative Liabilities: Non-current   160   34   126 (d)
            
   December 31, 2012
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 3 $ ― $ 3 (a)
Derivative Assets: Non-current          
Subject to Master Netting   8   ―   8 (b)
Derivative Liabilities: Current          
Subject to Master Netting   244   22   222 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   192   36   156 
Not Subject to Master Netting   4   ―   4 
Total Derivative Liabilities: Non-current   196   36   160 (d)
            
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
  Three Months Ended March 31,
(in millions)2013 2012
Pre-tax Gains (Losses) Recorded in AOCI     
Commodity contracts$ 1 $ ―
Interest rate contracts  ―   4
Total Pre-tax Gains (Losses) Recorded in AOCI$ 1 $ 4
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)     
Interest rate contracts(b)     
Interest expense$ ― $ (4)
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ ― $ (4)
       
(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 March 31,
(in millions)2013 2012
Location of Pre-tax Gains and (Losses) Recognized in Earnings     
Commodity contracts     
Revenue, regulated electric$ 6 $ ―
Fuel used in electric generation and purchased power - regulated(a)  (52)   (105)
Other income and expenses, net  ―   8
Interest rate contracts     
Interest expense  (4)   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (50) $ (97)
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities     
Commodity contracts(c)     
Regulatory asset$ 105 $ (206)
Interest rate contracts(b)     
Regulatory asset  5   ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 110 $ (206)
       
(a)After the settlement of the derivatives and the consumption of the fuel, gains or losses are passed through the fuel cost-recovery clause.
(b)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.
(c)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.
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
   March 31, 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 $ 512 $ 230 $ 79 $ 151 $ 279
Collateral already posted   215   35   3   32   180
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   202   195   76   119   7
                 
   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
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
             
  March 31, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 107 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  108   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  35   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  3   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  32   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  72   ―   15   ―
Amounts not offset against net derivative positions$ 108 $ ― $ 92 $ ―
  
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
             
  March 31, 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$ 4 $ ― $ 1 $ ―
Investments and other assets: other  ―   ―   1   ―
Current liabilities: other  8   52   ―   85
Deferred credits and other liabilities: other  2   54   ―   68
Interest rate contracts            
Current liabilities: other  ―   ―   ―   11
Total Derivatives Not Designated as Hedging Instruments$ 14 $ 106 $ 2 $ 164
Total Derivatives$ 14 $ 108 $ 2 $ 166
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Offsetting Assets and Liabilities
   March 31, 2013
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 12 $ 8 $ 4 (a)
Derivative Assets: Non-current          
Subject to Master Netting   2   2   ― (b)
Derivative Liabilities: Current          
Subject to Master Netting   53   8   45 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   55   5   50 (d)
            
   December 31, 2012
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 1 $ ― $ 1 (a)
Derivative Assets: Non-current          
Subject to Master Netting   1   ―   1 (b)
Derivative Liabilities: Current          
Subject to Master Netting   97   2   95 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   69   7   62 (d)
            
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
  Three Months Ended March 31,
(in millions)2013 2012
Pre-tax Gains (Losses) Recorded in AOCI     
Interest rate contracts(b)$ ― $ 5
Total Pre-tax Gains (Losses) Recorded in AOCI$ ― $ 5
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)     
Interest rate contracts(b)     
Interest expense$ ― $ (3)
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ ― $ (3)
       
(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 March 31,
(in millions)2013 2012
Location of Pre-tax Gains and (Losses) Recognized in Earnings     
Commodity contracts     
Revenue, regulated electric$ 6 $ ―
Fuel used in electric generation and purchased power -regulated(a)  (17)   (26)
Interest rate contracts     
Interest expense  (3)   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (14) $ (26)
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities     
Commodity contracts(c)     
Regulatory asset$ 36 $ (59)
Interest rate contracts(b)     
Regulatory asset  3   ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 39 $ (59)
       
(a)After the settlement of the derivatives and the consumption of fuel, gains or losses are passed through the fuel cost-recovery clause.
(b)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.
(c)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.
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
   March 31, 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 $ 512 $ 230 $ 79 $ 151 $ 279
Collateral already posted   215   35   3   32   180
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   202   195   76   119   7
                 
   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
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
             
  March 31, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 107 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  108   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  35   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  3   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  32   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  72   ―   15   ―
Amounts not offset against net derivative positions$ 108 $ ― $ 92 $ ―
  
Duke Energy Florida [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
             
  March 31, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments            
Commodity contracts           
Current liabilities: other$ ― $ ― $ ― $ 1
Total Derivatives Designated as Hedging Instruments$ ― $ ― $ ― $ 1
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current Assets: Other$ 8 $ ― $ 2 $ ―
Investments and Other Assets: Other  2   ―   7   ―
Current liabilities: other  13   89   ―   146
Deferred credits and other liabilities: other  10   101   ―   123
Total Derivatives Not Designated as Hedging Instruments$ 33 $ 190 $ 9 $ 269
Total Derivatives$ 33 $ 190 $ 9 $ 270
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Offsetting Assets and Liabilities
   March 31, 2013
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on Condensed Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 21 $ 13 $ 8 (a)
Derivative Assets: Non-current          
Subject to Master Netting   12   10   2 (b)
Derivative Liabilities: Current          
Subject to Master Netting   89   26   63 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   101   29   72 (d)
            
   December 31, 2012
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on Condensed Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 2 $ ― $ 2 (a)
Derivative Assets: Non-current          
Subject to Master Netting   7   ―   7 (b)
Derivative Liabilities: Current          
Subject to Master Netting   147   20   127 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   123   29   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 March 31,
(in millions)2013 2012
Location of Pre-tax Gains and (Losses) Recognized in Earnings     
Commodity contracts     
Fuel used in electric generation and purchased power - regulated(a)$ (35) $ (79)
Interest rate contracts     
Interest expense  (1)   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (36) $ (79)
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities     
Commodity contracts(b)     
Regulatory asset$ 69 $ (147)
Interest rate contracts     
Regulatory asset  1   ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 70 $ (147)
       
(a)After the settlement of the derivatives and the consumption of fuel, 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
   March 31, 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 $ 512 $ 230 $ 79 $ 151 $ 279
Collateral already posted   215   35   3   32   180
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   202   195   76   119   7
                 
   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
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
             
  March 31, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 107 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  108   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  35   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  3   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  32   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  72   ―   15   ―
Amounts not offset against net derivative positions$ 108 $ ― $ 92 $ ―
  
Duke Energy Ohio [Member]
    
Derivative [Line Items]    
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk
   March 31, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   238   ―   ―   27   200
Fair value hedges   250   ―   ―   250   ―
 Total notional amount $ 1,535 $ ― $ ― $ 277 $ 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
             
  March 31, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Interest rate contracts           
Current assets: other$ 2 $ ― $ 2 $ ―
Total Derivatives Designated as Hedging Instruments$ 2 $ ― $ 2 $ ―
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current assets: other$ 42 $ 32 $ 31 $ 4
Investments and other assets: other  13   7   81   51
Current liabilities: other  130   182   106   132
Deferred credits and other liabilities: other  57   91   ―   4
Interest rate contracts            
Current liabilities: other  ―   1   ―   1
Deferred credits and other liabilities: other  ―   6   ―   7
Total Derivatives Not Designated as Hedging Instruments$ 242 $ 319 $ 218 $ 199
Total Derivatives$ 244 $ 319 $ 220 $ 199
  
Offsetting Assets and Liabilities
   March 31, 2013
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 172 $ 163 $ 9 
Not Subject to Master Netting   2   ―   2 
Total Derivative Assets: Current   174   163   11 (a)
Derivative Assets: Non-current          
Subject to Master Netting   70   63   7 (b)
Derivative Liabilities: Current          
Subject to Master Netting   214   209   5 
Not Subject to Master Netting   1   ―   1 
Total Derivative Liabilities: Current   215   209   6 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   98   90   8 
Not Subject to Master Netting   6   ―   6 
Total Derivative Liabilities: Non-current   104   90   14 (d)
            
   December 31, 2012
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheet 
Derivative Assets: Current          
Subject to Master Netting $ 137 $ 110 $ 27 
Not Subject to Master Netting   2   ―   2 
Total Derivative Assets: Current   139   110   29 (a)
Derivative Assets: Non-current          
Subject to Master Netting   81   51   30 (b)
Derivative Liabilities: Current          
Subject to Master Netting   136   125   11 
Not Subject to Master Netting   1   ―   1 
Total Derivative Liabilities: Current   137   125   12 (c)
Derivative Liabilities: Non-current          
Subject to Master Netting   55   51   4 
Not Subject to Master Netting   7   ―   7 
Total Derivative Liabilities: Non-current   62   51   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 March 31,
(in millions)2013 2012
Location of Pre-tax Gains and (Losses) Recognized in Earnings     
Commodity contracts     
Revenue, nonregulated electric, natural gas and other$ (91) $ 71
Fuel used in electric generation and purchased power - nonregulated  (7)   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (98) $ 71
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities     
Commodity contracts     
Regulatory asset$ ― $ (2)
Interest rate contracts     
Regulatory asset  1   1
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 1 $ (1)
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
   March 31, 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 $ 512 $ 230 $ 79 $ 151 $ 279
Collateral already posted   215   35   3   32   180
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period   202   195   76   119   7
                 
   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
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
             
  March 31, 2013 December 31, 2012
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 107 $ ― $ 73 $ ―
Amounts not offset against net derivative positions  108   ―   93   ―
Progress Energy           
Amounts offset against net derivative positions  35   ―   58   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Progress           
Amounts offset against net derivative positions  3   ―   9   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Duke Energy Florida           
Amounts offset against net derivative positions  32   ―   49   ―
Amounts not offset against net derivative positions  ―   ―   1   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  72   ―   15   ―
Amounts not offset against net derivative positions$ 108 $ ― $ 92 $ ―
  
Duke Energy Indiana [Member]
    
Derivative [Line Items]    
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk
   March 31, 2013
(in millions) Duke Energy Progress Energy Duke Energy Progress Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 1,047 $ ― $ ― $ ― $ ―
Undesignated contracts   238   ―   ―   27   200
Fair value hedges   250   ―   ―   250   ―
 Total notional amount $ 1,535 $ ― $ ― $ 277 $ 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
             
  March 31, 2013 December 31, 2012
(in millions)Asset Liability Asset Liability
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current assets: other$ 5 $ ― $ 10 $ ―
Interest rate contracts            
Current liabilities: other  ―   55   ―   63
Total Derivatives Not Designated as Hedging Instruments$ 5 $ 55 $ 10 $ 63
Total Derivatives$ 5 $ 55 $ 10 $ 63
  
Offsetting Assets and Liabilities
   March 31, 2013
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheets 
Derivative Assets: Current          
Subject to Master Netting $ 5 $ ― $ 5 (a)
Derivative Liabilities: Current          
Not Subject to Master Netting   55   ―   55 (b)
            
   December 31, 2012
(in millions) Gross amounts recognized Gross amounts offset Net amounts included on the Condensed Consolidated Balance Sheets 
Derivative Assets: Current          
Subject to Master Netting $ 10 $ ― $ 10 (a)
Derivative Liabilities: Current          
Not Subject to Master Netting   63   ―   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 March 31,
(in millions)2013 2012
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities     
Commodity contracts     
Regulatory liability$ 4 $ 4
Interest rate contracts     
Regulatory asset  8   21
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 12 $ 25