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Risk Management, Derivative Instruments And Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]    
Notional Amounts Of Derivative Instruments Related To Interest Rate Risk
   December 31, 2012
(in millions) Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida 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
                       
   December 31, 2011
(in millions) Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
Cash flow hedges(a) $ 841 $ ― $ 500 $ 250 $ 50 $ ― $ ―
Undesignated contracts   247   ―   ―   ―   ―   27   200
Fair value hedges   275   25   ―   ―   ―   250   ―
 Total notional amount $ 1,363 $ 25 $ 500 $ 250 $ 50 $ 277 $ 200
                       
Underlying Notional Amounts for Commodity Derivative Instruments Accounted for at Fair Value
  December 31, 2012
  Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress 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
Electricity-capacity (Gigawatt-months) 5  ―  5  5  ―  ―  ―
Oil (millions of gallons) 5  ―  5  ―  5  ―  ―
Natural gas (millions of decatherms) 528  ―  348  118  230  180  ―
               
  December 31, 2011
  Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
Commodity contracts             
Electricity-energy (Gigawatt-hours)(a) 14,118  ―  ―  ―  ―  14,655  682
Emission allowances NOX (thousands of tons) 9  ―  ―  ―  ―  9  ―
Oil (millions of gallons) ―  ―  10  ―  10  ―  ―
Natural gas (millions of decatherms) 40  ―  347  103  244  2  1
               
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
  December 31, 2012  December 31, 2011
(in millions)Asset Liability  Asset Liability
Derivatives Designated as Hedging Instruments            
Commodity contracts            
Current liabilities: other$ ― $ 2  $ ― $ ―
Deferred credits and other liabilities: other     1    ―   ―
Interest rate contracts            
Current assets: other  2   ―    4   ―
Investments and other assets: other  7   ―    2   ―
Current Liabilities: Other  ―   81    ―   11
Deferred credits and other liabilities: other  ―   35    ―   76
Total Derivatives Designated as Hedging Instruments$ 9 $ 119  $ 6 $ 87
Derivatives Not Designated as Hedging Instruments            
Commodity contracts            
Current assets: other$ 41 $ 2  $ 81 $ 31
Investments and other assets: other  106   50    35   17
Current liabilities: other  106   407    136   168
Deferred credits and other liabilities: other  2   255    25   93
Interest rate contracts             
Current liabilities: other  ―   76    ―   2
Deferred credits and other liabilities: other  ―   8    ―   75
Total Derivatives Not Designated as Hedging Instruments$ 255 $ 798  $ 277 $ 386
Total Derivatives$ 264 $ 917  $ 283 $ 473
  
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
 The following table shows the amount of gains and losses recognized on derivative instruments designated and qualifying as cash
flow hedges by type of derivative contract, and the Consolidated Statements of Operations line items in which such gains and losses are included when reclassified from AOCI.
          
  Year Ended December 31,
(in millions)2012 2011 2010
Pre-tax Gains (Losses) Recorded in AOCI        
Interest rate contracts$ (23) $ (88) $ 2
Commodity contracts  1   ―   ―
Total Pre-tax Gains (Losses) Recorded in AOCI$ (22) $ (88) $ 2
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)        
Fuel used in electric generation and purchased power$ ― $ ― $2
Interest rate contracts        
Interest expense  2   (5)   (5)
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ 2 $ (5) $ (3)
          
(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.
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Recognized in Earnings        
Commodity contracts        
Revenue, regulated electric$ (23) $ ― $ 1
Revenue, nonregulated electric, natural gas and other  38   (59)   (38)
Other income and expenses  (2)   ―   ―
Fuel used in electric generation and purchased power regulated  (194)   ―   ―
Fuel used in electric generation and purchased power - nonregulated  2   (1)   9
Interest rate contracts        
Interest expense  (8)   ―   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (187) $ (60) $ (28)
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities        
Commodity contracts        
Regulatory asset$ (2) $ (1) $ 5
Regulatory liability  36   17   14
Interest rate contracts        
Regulatory asset  10   (165)   (1)
Regulatory liability  ―   (60)   60
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 44 $ (209) $ 78
  
Schedule Of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
   December 31, 2012
(in millions) Duke Energy Progress Energy Progress Energy Carolinas Progress 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
                 
   December 31, 2011
(in millions) Duke Energy Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio
Aggregate fair value amounts of derivative instruments in a net liability position $ 96 $ 489 $ 152 $ 337 $ 94
Collateral already posted $ 36 $ 147 $ 24 $ 123 $ 35
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period $ 5 $ 342 $ 128 $ 214 $ 5
                 
Schedule Of Cash Collateral Under Master Netting Arrangements
  December 31, 2012 December 31, 2011
(in millions)Receivables Payables Receivables Payables
Duke Energy           
Amounts offset against net derivative positions$ 73 $ ― $ 10 $ ―
Amounts not offset against net derivative positions  93   ―   30   ―
Progress Energy           
Amounts offset against net derivative positions  58   ―   140   ―
Amounts not offset against net derivative positions  1   ―   3   ―
Progress Energy Carolinas           
Amounts offset against net derivative positions  9   ―   23   ―
Amounts not offset against net derivative positions  ―   ―   ―   ―
Progress Energy Florida           
Amounts offset against net derivative positions  49   ―   117   ―
Amounts not offset against net derivative positions  1   ―   3   ―
Duke Energy Ohio           
Amounts offset against net derivative positions  15   ―   9   ―
Amounts not offset against net derivative positions$ 92 $ ― $ 28 $ ―
  
Duke Energy Carolinas [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
  December 31, 2012 December 31, 2011
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Interest rate contracts           
Current assets: other$ ― $ ― $ 1 $ ―
Total Derivatives Designated as Hedging Instruments$ ― $ ― $ 1 $ ―
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current liabilities: other  ―   6   ―   ―
Deferred credits and other liabilities: other  ―   6   ―   ―
Total Derivatives Not Designated as Hedging Instruments$ ― $ 12 $ ― $ ―
Total Derivatives$ ― $ 12 $ 1 $ ―
  
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
 The following table shows the amount of gains and losses recognized on derivative instruments designated and qualifying as cash
flow hedges by type of derivative contract, and the Consolidated Statements of Operations line items in which such gains and losses are included when reclassified from AOCI.
          
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)        
Interest rate contracts        
Interest expense  (3)   (5) $ (6)
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ (3) $ (5) $ (6)
          
(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.
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Recognized in Earnings        
Commodity contracts        
Revenue, regulated electric$ (12) $ ― $ 1
Total Pre-tax (Losses) Gains Recognized in Earnings$ (12) $ ― $ 1
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities        
Commodity contracts        
Regulatory liability$ ― $ ― $ (1)
Interest rate contracts        
Regulatory asset$ ― $ (94)   ―
Regulatory liability  ―   (60)   60
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ ― $ (154) $ 59
  
Progress Energy [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
  December 31, 2012 December 31, 2011
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Commodity contracts           
Current liabilities: other$ ― $ 2 $ ― $ 2
Deferred credits and other liabilities: other  ―   1   ―   1
Interest rate contracts           
Current liabilities: other  ―   ―   ―   76
Deferred credits and other liabilities: other  ―   ―   ―   17
Total Derivatives Designated as Hedging Instruments$ ― $ 3 $ ― $ 96
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current assets: other$ 3 $ ― $ ― $ ―
Investments and other assets: other  8   ―   ―   ―
Current liabilities: other  ―   231   5   371
Deferred credits and other liabilities: other  ―   195   ―   332
Interest rate contracts            
Current liabilities: other  ―   11   ―   ―
Total Derivatives Not Designated as Hedging Instruments$ 11 $ 437 $ 5 $ 703
Total Derivatives$ 11 $ 440 $ 5 $ 799
             
  
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
 The following table shows the amount of gains and losses recognized on derivative instruments designated and qualifying as cash
flow hedges by type of derivative contract, and the Consolidated Statements of Operations and Comprehensive Income line items in which such gains and losses are included when reclassified from AOCI.
          
  Year Ended December 31,
(in millions)2012 2011 2010
Pre-tax Gains (Losses) Recorded in AOCI(a)        
Commodity contracts$ 1 $ (3) $ ―
Interest rate contracts$ (11) $ (141) $ (57)
Total Pre-tax Gains (Losses) Recorded in AOCI$ (10) $ (144) $ (57)
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)        
Interest rate contracts(b)        
Interest expense$ (14) $ (13) $ (11)
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ (14) $ (13) $ (11)
Location of Pre-tax Gains and (Losses) Reclassified from AOCI to Regulatory Assets or Liabilities(c)        
Interest rate contracts        
Regulatory Assets$ (159) $ ― $ ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets or Liabilities$ (159) $ ― $ ―
          
(a)Effective portion.
(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.
(c)To conform to Duke Energy policies, effective with the merger, Progress Energy no longer designates derivative instruments related to interest rate cash flow hedges for regulated operations as cash flow hedges. As a result, the pre-tax losses on open derivative contracts as of the date of the merger were reclassified from AOCI to Regulatory assets.
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Recognized in Earnings        
Commodity contracts        
Revenue, regulated electric$ (11) $ 1 $ 1
Fuel used in electric generation and purchased power - regulated(a)  (454)   (297)   (324)
Other income and expenses, net  7   (59)   ―
Interest rate contracts        
Interest expense  (8)   ―   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (466) $ (355) $ (323)
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities        
Commodity contracts(c)        
Regulatory asset$ (171) $ (502) $ (398)
Interest rate contracts(b)        
Regulatory asset  6   ―   ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ (165) $ (502) $ (398)
          
(a)After settlement of the derivatives and the fuel is consumed, 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 Balance Sheets until derivatives are settled.
  
Progress Energy Carolinas [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
  December 31, 2012 December 31, 2011
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Commodity contracts           
Current liabilities: other$ ― $ 1 $ ―   ―
Deferred credits and other liabilities: other  ―   1   ―   ―
Interest rate contracts           
Current liabilities: other  ―   ―   ―   38
Deferred credits and other liabilities: other  ―   ―   ―   9
Total Derivatives Designated as Hedging Instruments$ ― $ 2 $ ― $ 47
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current assets: other$ 1 $ ― $ ― $ ―
Investments and other assets: other  1   ―   ―   ―
Current liabilities: other  ―   85   ―   91
Deferred credits and other liabilities: other  ―   68   ―   110
Interest rate contracts            
Current liabilities: other  ―   11   ―   ―
Total Derivatives Not Designated as Hedging Instruments$ 2 $ 164 $ ― $ 201
Total Derivatives$ 2 $ 166 $ ― $ 248
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
 The following table shows the amount of gains and losses recognized on derivative instruments designated and qualifying as cash
flow hedges by type of derivative contract, and the Consolidated Statements of Operations and Comprehensive Income line items in which such gains and losses are included when reclassified from AOCI.
          
  Year Ended December 31,
(in millions)2012 2011 2010
Pre-tax Gains (Losses) Recorded in AOCI(a)        
Interest rate contracts(b)$ (7) $ (70) $ (16)
Total Pre-tax Gains (Losses) Recorded in AOCI$ (7) $ (70) $ (16)
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)        
Interest rate contracts        
Interest expense$ (5) $ (7) $ (7)
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ (5) $ (7) $ (7)
Location of Pre-tax Gains and (Losses) Reclassified from AOCI to Regulatory Assets or Liabilities(c )        
Interest rate contracts        
Regulatory assets$ (117) $ ― $ ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets or Liabilities$ (117) $ ― $ ―
          
(a)Effective portion.
(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.
(c)To conform to Duke Energy policies, effective with the merger, Progress Energy no longer designates derivative instruments related to interest rate cash flow hedges for regulated operations as cash flow hedges. As a result, the pre-tax losses on open derivative contracts as of the date of the merger were reclassified from AOCI to Regulatory assets.
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Recognized in Earnings        
Commodity contracts        
Revenue, regulated electric$ (11) $ 1 $ 1
Fuel used in electric generation and purchased power -regulated(a)  (115)   (60)   (46)
Interest rate contracts        
Interest expense  (6)   ―   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (132) $ (59) $ (45)
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities        
Commodity contracts(c)        
Regulatory asset$ (55) $ (140) $ (77)
Interest rate contracts(b)        
Regulatory asset  6   ―   ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ (49) $ (140) $ (77)
          
(a)After settlement of the derivatives and the fuel is consumed, 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 Balance Sheets until derivatives are settled.
  
Progress Energy Florida [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
  December 31, 2012 December 31, 2011
(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
Interest rate contracts            
Deferred credits and other liabilities: other  ―   ―   ―   8
Total Derivatives Designated as Hedging Instruments$ ― $ 1 $ ― $ 11
Derivatives Not Designated as Hedging Instruments           
Commodity contracts(a)           
Current Assets: Other$ 2 $ ― $ ― $ ―
Investments and Other Assets: Other  7   ―   ―   ―
Current liabilities: other  ―   146   5   266
Deferred credits and other liabilities: other  ―   123   ―   222
Total Derivatives Not Designated as Hedging Instruments$ 9 $ 269 $ 5 $ 488
Total Derivatives$ 9 $ 270 $ 5 $ 499
             
(a)Substantially all of these contracts receive regulatory treatment.
  
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
 The following table shows the amount of gains and losses recognized on derivative instruments designated and qualifying as cash
flow hedges by type of derivative contract, and the Consolidated Statements of Operations and Comprehensive Income line items in which such gains and losses are included when reclassified from AOCI.
          
  Year Ended December 31,
(in millions)2012 2011 2010
Pre-tax Gains (Losses) Recorded in AOCI(a)        
Commodity contracts$ 1 $ (3) $ ―
Interest rate contracts(b)  (2)   (35)   (11)
Total Pre-tax Gains (Losses) Recorded in AOCI$ (1) $ (38) $ (11)
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)        
Interest rate contracts(b)        
Interest expense$ (2) $ (1) $ ―
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ (2) $ (1) $ ―
Location of Pre-tax Gains and (Losses) Reclassified from AOCI to Regulatory Assets(c)        
Interest rate contracts        
Regulatory assets$ (42) $ ― $ ―
Total Pre-tax Gains (Losses) Reclassified from AOCI to Regulatory Assets$ (42) $ ― $ ―
          
(a)Effective portion
(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.
(c)To conform to Duke Energy policies, effective with the merger, Progress Energy no longer designates derivative instruments related to interest rate cash flow hedges for regulated operations as cash flow hedges. As a result, the pre-tax losses on open derivative contracts as of the date of the merger were reclassified from AOCI to Regulatory assets.
          
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Recognized in Earnings        
Commodity contracts        
Fuel used in electric generation and purchased power - regulated(a)$ (339) $ (237) $ (278)
Interest rate contracts        
Interest expense  (2)   ―   ―
Total Pre-tax (Losses) Gains Recognized in Earnings$ (341) $ (237) $ (278)
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities        
Commodity contracts(b)        
Regulatory asset$ (116) $ (362) $ (321)
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ (116) $ (362) $ (321)
          
(a)After settlement of the derivatives 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 Balance Sheets until derivatives are settled.
  
Duke Energy Ohio [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
  December 31, 2012 December 31, 2011
(in millions)Asset Liability Asset Liability
Derivatives Designated as Hedging Instruments           
Interest rate contracts           
Current assets: other$ 2 $ ― $ 3 $ ―
Investments and other assets: other  ―   ―   2   ―
Total Derivatives Designated as Hedging Instruments$ 2 $ ― $ 5 $ ―
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current assets: other$ 31 $ 4 $ 79 $ 39
Investments and other assets: other  81   51   29   18
Current liabilities: other  106   132   136   146
Deferred credits and other liabilities: other  ―   4   22   33
Interest rate contracts            
Current liabilities: other  ―   1   ―   1
Deferred credits and other liabilities: other  ―   7   ―   8
Total Derivatives Not Designated as Hedging Instruments$ 218 $ 199 $ 266 $ 245
Total Derivatives$ 220 $ 199 $ 271 $ 245
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Recognized in Earnings        
Commodity contracts        
Revenue, nonregulated electric, natural gas and other  76   (26)   (3)
Fuel used in electric generation and purchased power - nonregulated  2   (1)   9
Interest rate contracts        
Interest expense  (1)   (1)   (1)
Total Pre-tax (Losses) Gains Recognized in Earnings$ 77 $ (28) $ 5
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities        
Commodity contracts        
Regulatory asset$ 2 $ 1 $ 5
Regulatory liability  (1)   ―   ―
Interest rate contracts        
Regulatory asset  ―   (4)   (1)
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 1 $ (3) $ 4
  
Duke Energy Indiana [Member]
    
Derivative [Line Items]    
Location And Fair Value Amounts Of Derivatives Reflected In The Condensed Consolidated Balance Sheets
  December 31, 2012 December 31, 2011
(in millions)Asset Liability Asset Liability
Derivatives Not Designated as Hedging Instruments           
Commodity contracts           
Current assets: other$ 10 $ ― $ 4 $ ―
Current liabilities: other  ―   ―   ―   2
Interest rate contracts            
Current liabilities: other  ―   63   ―   ―
Deferred credits and other liabilities: other  ―   ―   ―   66
Total Derivatives Not Designated as Hedging Instruments$ 10 $ 63 $ 4 $ 68
Total Derivatives$ 10 $ 63 $ 4 $ 68
  
Cash Flow Hedges-Location And Amount Of Pre-Tax (Losses) Recognized In Comprehensive Income
 The following table shows the amount of gains and losses recognized on derivative instruments designated and qualifying as cash
flow hedges by type of derivative contract, and the Consolidated Statements of Operations line items in which such gains and losses are included when reclassified from AOCI.
          
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings(a)        
Interest rate contracts        
Interest expense  3   2 $ 3
Total Pre-tax Gains (Losses) Reclassified from AOCI into Earnings$ 3 $ 2 $ 3
          
(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.
  
Undesignated Contracts - Location And Amount Of Pre-Tax Gains And (Losses) Recognized In Income Or As Regulatory Assets Or Liabilities
  Year Ended December 31,
(in millions)2012 2011 2010
Location of Pre-tax Gains and (Losses) Recognized as Regulatory Assets or Liabilities        
Commodity contracts        
Regulatory asset$ 2 $ (2) $ ―
Regulatory liability  35   17   14
Interest rate contracts        
Regulatory asset  4   (67)   ―
Total Pre-tax Gains (Losses) Recognized as Regulatory Assets of Liabilities$ 41 $ (52) $ 14