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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule of Regulatory Assets and Liabilities
  As of December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory Assets                    
Vacation accrual$ 245 $ 85 $ 65 $ 65 $ - $ 7 $ 13
Nuclear deferral  65   -   65   -   65   -   -
Demand side management (DSM) costs/Energy efficiency (EE)  58   36   -   -   -   22   -
Deferred fuel costs  162   -   109   -   109   1   52
Over-distribution of Bulk Power Marketing (BPM) sharing  43   43   -   -   -   -   -
Post in-service carrying costs and deferred operating expenses  29   27   -   -   -   -   2
Gasification services agreement buyout costs  25   -   -   -   -   -   25
Other  110   30   17   12   5   16   34
Total Current Regulatory Assets(a)  737   221   256   77   179   46   126
Accrued pension and post-retirement  3,306   602   1,650   769   754   225   325
Retired generation facilities  1,781   -   1,720   128   1,592   -   61
Debt fair value adjustment  1,472   -   -   -   -   -   -
Asset retirement obligations  1,461   48   713   372   341   -   -
Net regulatory asset related to income taxes  1,373   731   401   175   226   82   158
Hedge costs and other deferrals  710   88   550   240   310   9   63
DSM costs/Energy efficiency  264   71   121   121   -   72   -
Post in-service carrying costs and deferred operating expenses  93   -   -   -   -   19   74
Regional Transmission Organization (RTO) costs  83   10   5   5   -   72   -
Manufactured gas plant (MGP) costs  77   -   -   -   -   77   -
Gasification services agreement buyout costs  70   -   -   -   -   -   70
Nuclear deferral  77   -   77   -   77   -   -
Other  237   177   55   35   21   23   59
Total Non-Current Regulatory Assets  11,004   1,727   5,292   1,845   3,321   579   810
Total Regulatory Assets$ 11,741 $ 1,948 $ 5,548 $ 1,922 $ 3,500 $ 625 $ 936

  As of December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory Liabilities                    
Deferred fuel costs$ 55 $ 45 $ 10 $ 10 $ - $ - $ -
DSM costs/Energy efficiency  49   9   17   -   17   15   8
Other  52   24   1   -   1   24   3
Total Current Regulatory Liabilities(b)  156   78   28   10   18   39   11
Removal costs  4,827   1,928   2,048   1,503   401   236   624
Amounts to be refunded to customers  290   -   259   -   259   -   31
Storm reserve  125   -   125   -   125   -   -
Accrued pension and post-retirement benefits  103   -   -   -   -   18   68
Other  239   174   37   35   2   -   18
Total Non-Current Regulatory Liabilities  5,584   2,102   2,469   1,538   787   254   741
Total Regulatory Liabilities$ 5,740 $ 2,180 $ 2,497 $ 1,548 $ 805 $ 293 $ 752
  As of December 31, 2011
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory Assets                    
Vacation accrual$ 150 $ 70 $ - $ - $ - $ 7 $ 13
DSM costs/Energy efficiency  52   25   -   -   -   9   18
Over-distribution of BPM sharing  41   41   -   -   -   -   -
Deferred fuel costs  38   -   275   31   244   10   28
Post in-service carrying costs and deferred operating expenses  31   28   -   -   -   -   3
Gasification services agreement buyout costs  25   -   -   -   -   -   25
Other  37   8   -   -   -   2   27
Total Current Regulatory Assets(a)  374   172   275   31   244   28   114
Accrued pension and post-retirement  1,726   734   1,506   691   702   212   314
Net regulatory asset related to income taxes  892   668   352   140   212   77   147
Asset retirement obligations  191   191   540   496   44   -   -
Hedge costs and other deferrals  166   91   703   200   503   8   67
Post in-service carrying costs and deferred operating expenses  119   31   -   -   -   16   72
Nuclear deferral  -   -   129   -   129   -   -
Gasification services agreement buyout costs  88   -   -   -   -   -   88
RTO costs  80   13   7   7   -   74   -
Retired generation facilities  73   -   15   15   -   -   73
MGP costs  69   -   -   -   -   69   -
DSM costs/Energy efficiency  70   38   92   92   -   32   -
Other  198   128   80   41   39   32   37
Total Non-Current Regulatory Assets  3,672   1,894   3,424   1,682   1,629   520   798
Total Regulatory Assets$ 4,046 $ 2,066 $ 3,699 $ 1,713 $ 1,873 $ 548 $ 912

  As of December 31, 2011
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
Regulatory Liabilities                    
DSM costs/Energy efficiency$ 41 $ 41 $ 19 $ - $ 19 $ - $ -
Nuclear deferral  -   -   15   -   15   -   -
Other  46   21   14   2   12   22   3
Total Current Regulatory Liabilities(b)  87   62   48   2   46   22   3
Removal costs  2,586   1,770   2,240   1,529   550   230   590
Accrued pension and post-retirement benefits  117   -   -   -   -   19   70
Amount to be refunded to customers  -   -   288   -   288   -   -
Storm reserve  -   -   135   -   135   -   -
Other  216   158   64   14   51   24   23
Total Non-Current Regulatory Liabilities  2,919   1,928   2,727   1,543   1,024   273   683
Total Regulatory Liabilities$ 3,006 $ 1,990 $ 2,775 $ 1,545 $ 1,070 $ 295 $ 686
                      
(a)Included in Other within Current Assets on the Consolidated Balance Sheets.
(b)Included in Other within Current Liabilities on the Consolidated Balance Sheets.
Schedule of Restricted Net Assets
(in billions)Total Duke Energy Subsidiaries Duke Energy Carolinas Progress Energy Progress Energy Carolinas Duke Energy Ohio(a)Duke Energy Indiana
Amounts that may not be transferred to Duke Energy without appropriate approval based on above mentioned Merger Conditions$ 10.3 $ 2.8 $ 2.0 $ 1.9 $ 3.9$ 1.4
                  
(a)As of December 31, 2012, the equity balance available for payment of dividends, based on the FERC and PUCO order discussed above, was $1.3 billion.
 
Schedule of Potential Plant Retirements
   December 31, 2012
    Duke Energy  Duke Energy Carolinas(b)(e) Progress Energy Carolinas(c)(e) Progress Energy Florida(d) Duke Energy Ohio(f) Duke Energy Indiana(g)
Capacity (in MW)  3,954   910  575  873  928  668
Remaining net book value (in millions)(a)$ 428 $ 106$ 63$ 115$ 12$ 132
                
(a)Included in Property, plant and equipment, net as of December 31, 2012, on the Consolidated Balance Sheets, unless otherwise noted.
(b) Includes Riverbend Units 4 through 7, Lee Units 1 and 2 and Buck Units 5 and 6. Duke Energy Carolinas has committed to retire 1,667 MW in conjunction with a Cliffside air permit settlement, of which 587 MW have already been retired as of December 31, 2012. Duke Energy Carolinas plans to retire 710 MW for the Riverbend Units 4 though 7 and Buck Units 5 and 6 effective April 1, 2013. Excludes 170 MW Lee Unit 3 that is expected to be converted to gas in 2014. The Lee Unit 3 conversion will be considered a retirement toward meeting the 1,667 MW retirement commitment.
(c) Includes Sutton Station, which is expected to be retired by the end of 2013.
(d)Includes Crystal River Units 1 and 2.
(e)Net book value of Duke Energy Carolinas' Buck Units 5 and 6 of $73 million, and Progress Energy Carolinas' Sutton Station of $63 million is included in Generation facilities to be retired, net, on the Consolidated Balance Sheets at December 31, 2012.
(f)Includes Beckjord Station Units 2 through 6 and Miami Fort Unit 6. Beckjord has no remaining book value. Beckjord Unit 1 was retired May 1, 2012.
(g)Includes Wabash River Units 2 through 6.
                
 Duke Energy continues to evaluate the potential need to retire these coal-fired generating facilities earlier than the current
estimated useful lives, and plans to seek regulatory recovery for amounts that would not be otherwise recovered when any of these assets are retired. However, such recovery, including recovery of carrying costs on remaining book values, could be subject to future regulatory approvals and therefore cannot be assured.
 
Duke Energy Carolinas [Member]
    
Schedule of Restricted Net Assets
(in billions)Total Duke Energy Subsidiaries Duke Energy Carolinas Progress Energy Progress Energy Carolinas Duke Energy Ohio(a)Duke Energy Indiana
Amounts that may not be transferred to Duke Energy without appropriate approval based on above mentioned Merger Conditions$ 10.3 $ 2.8 $ 2.0 $ 1.9 $ 3.9$ 1.4
                  
(a)As of December 31, 2012, the equity balance available for payment of dividends, based on the FERC and PUCO order discussed above, was $1.3 billion.
 
Progress Energy Carolinas [Member]
    
Schedule of Restricted Net Assets
(in billions)Total Duke Energy Subsidiaries Duke Energy Carolinas Progress Energy Progress Energy Carolinas Duke Energy Ohio(a)Duke Energy Indiana
Amounts that may not be transferred to Duke Energy without appropriate approval based on above mentioned Merger Conditions$ 10.3 $ 2.8 $ 2.0 $ 1.9 $ 3.9$ 1.4
                  
(a)As of December 31, 2012, the equity balance available for payment of dividends, based on the FERC and PUCO order discussed above, was $1.3 billion.
 
Progress Energy [Member]
    
Schedule of Restricted Net Assets
(in billions)Total Duke Energy Subsidiaries Duke Energy Carolinas Progress Energy Progress Energy Carolinas Duke Energy Ohio(a)Duke Energy Indiana
Amounts that may not be transferred to Duke Energy without appropriate approval based on above mentioned Merger Conditions$ 10.3 $ 2.8 $ 2.0 $ 1.9 $ 3.9$ 1.4
                  
(a)As of December 31, 2012, the equity balance available for payment of dividends, based on the FERC and PUCO order discussed above, was $1.3 billion.
 
Progress Energy Florida [Member]
    
Schedule of Crystal River Unit 3 Replacement and Repair Costs
(in millions) Replacement Power Costs  Repair Costs  Total
Spent to date$ 614 $ 338 $ 952
NEIL proceeds received to date  (162)   (143)   (305)
Balance for recovery(a)$ 452 $ 195 $ 647
          
(a)The portion of replacement power costs that has not been previously recovered from retail customers is classified within Regulatory assets on Duke Energy's Consolidated Balance Sheets and Progress Energy Florida's Balance Sheet as of December 31, 2012. Also, the $195 million of repair costs are classified within Regulatory assets on Duke Energy's Consolidated Balance Sheets and Progress Energy Florida's Balance Sheets as of December 31, 2012.
  
Duke Energy Ohio [Member]
    
Schedule of MISO Exit Fee Obligations
   Balance at Provision / Cash Balance at
(in millions) December 31, 2011 Adjustments Reductions December 31, 2012
Duke Energy Ohio $ 110 $ 5 $ (18) $ 97
  
Schedule of Restricted Net Assets
(in billions)Total Duke Energy Subsidiaries Duke Energy Carolinas Progress Energy Progress Energy Carolinas Duke Energy Ohio(a)Duke Energy Indiana
Amounts that may not be transferred to Duke Energy without appropriate approval based on above mentioned Merger Conditions$ 10.3 $ 2.8 $ 2.0 $ 1.9 $ 3.9$ 1.4
                  
(a)As of December 31, 2012, the equity balance available for payment of dividends, based on the FERC and PUCO order discussed above, was $1.3 billion.
 
Duke Energy Indiana [Member]
    
Schedule of Restricted Net Assets
(in billions)Total Duke Energy Subsidiaries Duke Energy Carolinas Progress Energy Progress Energy Carolinas Duke Energy Ohio(a)Duke Energy Indiana
Amounts that may not be transferred to Duke Energy without appropriate approval based on above mentioned Merger Conditions$ 10.3 $ 2.8 $ 2.0 $ 1.9 $ 3.9$ 1.4
                  
(a)As of December 31, 2012, the equity balance available for payment of dividends, based on the FERC and PUCO order discussed above, was $1.3 billion.