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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Organization And Basis Of Presentation [Line Items]    
Components Of Inventory
  December 31, 2013
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Materials and supplies$ 1,901 $ 654 $ 854 $ 567 $ 287 $ 117 $ 193
Coal held for electric generation  1,018   374   334   187   147   65   238
Oil, gas and other fuel held for electric generation  331   37   236   99   137   47   3
Total inventory$ 3,250 $ 1,065 $ 1,424 $ 853 $ 571 $ 229 $ 434
                     
  December 31, 2012
(in millions)Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Materials and supplies$ 1,691 $ 535 $ 768 $ 499 $ 269 $ 135 $ 161
Coal held for electric generation  1,187   488   392   232   160   82   216
Oil, gas and other fuel held for electric generation  345   39   281   97   184   10   3
Total inventory$ 3,223 $ 1,062 $ 1,441 $ 828 $ 613 $ 227 $ 380
                      
Schedule Of Composite Weighted-Average Depreciation Rates
          
  Years Ended December 31,
  2013 2012 2011
Duke Energy 2.8%  2.9%  3.2%
Duke Energy Carolinas 2.8%  2.8%  2.6%
Progress Energy 2.5%  2.6%  2.3%
Duke Energy Progress 2.5%  2.7%  2.1%
Duke Energy Florida 2.4%  2.5%  2.4%
Duke Energy Ohio 3.3%  3.2%  3.5%
Duke Energy Indiana 2.8%  3.3%  3.4%
          

                    
      December 31, 2013
(in millions)Estimated Useful Life (Years)  Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Land    $ 1,481$ 397$ 705$ 383$ 321$ 137$ 105
Plant - Regulated                  
 Electric generation, distribution and transmission2-125   78,272  30,018  31,792  19,190  12,601  3,925  11,594
 Natural gas transmission and distribution12-67   2,138  ―  ―  ―  ―  2,138  ―
 Other buildings and improvements2-100   1,397  447  610  282  315  190  159
Plant - Nonregulated                  
 Electric generation, distribution and transmission2-100   6,267  ―  ―  ―  ―  4,017  ―
 Other buildings and improvements9-100   2,512  ―  ―  ―  ―  5  ―
Nuclear fuel      2,458  1,446  1,012  1,012  ―  ―  ―
Equipment1-33   1,557  287  621  357  94  317  146
Construction in process      3,595  1,741  873  631  238  166  307
Other5-33   3,438  570  867  418  294  248  178
Total property, plant and equipment(a)(d)      103,115  34,906  36,480  22,273  13,863  11,143  12,489
Total accumulated depreciation - regulated(b)(c)(d)      (31,659)  (11,894)  (13,098)  (8,623)  (4,252)  (2,160)  (3,913)
Total accumulated depreciation - nonregulated(c)(d)      (1,966)  ―  ―  ―  ―  (748)  ―
Total net property, plant and equipment    $ 69,490$ 23,012$ 23,382$ 13,650$ 9,611$ 8,235$ 8,576
                    
(a)Includes capitalized leases of $1,606 million, $53 million, $328 million, $148 million, $180 million, $96 million, and $30 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, and Duke Energy Indiana, respectively, primarily in regulated plant. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $60 million, an insignificant amount and $57 million, respectively, of accumulated amortization of capitalized leases.
(b)Includes $1,118 million, $681 million, $438 million and $438 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(c)Includes accumulated amortization of capitalized leases of $40 million, $4 million, $21 million and $5 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.
(d)Includes gross property, plant and equipment cost of consolidated VIEs of $1,678 million and accumulated depreciation of consolidated VIEs of $175 million at Duke Energy.
                    
                    
      December 31, 2012
(in millions)Estimated Useful Life (Years)  Duke Energy Duke Energy Carolinas Progress Energy Duke Energy Progress Duke Energy Florida Duke Energy Ohio Duke Energy Indiana
Land    $ 1,368$ 378$ 618$ 380$ 239$ 136$ 90
Plant - Regulated                  
 Electric generation, distribution and transmission2-138   73,181  29,269  30,250  18,009  12,041  3,774  8,622
 Natural gas transmission and distribution12-60   2,026  ―  ―  ―  ―  2,026  ―
 Other buildings and improvements2-100   1,319  444  609  283  318  125  149
Plant - Nonregulated                  
 Electric generation, distribution and transmission2-100   6,055  ―  ―  ―  ―  3,870  ―
 Other buildings and improvements9-90   2,940  ―  ―  ―  ―  191  ―
Nuclear fuel      2,127  1,277  850  850  ―  ―  ―
Equipment1-34   1,448  279  604  336  90  255  141
Construction in process      6,655  1,996  1,424  946  474  204  2,836
Other5-60   3,272  547  791  380  270  243  174
Total property, plant and equipment(a)(d)      100,391  34,190  35,146  21,184  13,432  10,824  12,012
Total accumulated depreciation - regulated(b)(c)(d)      (29,471)  (11,437)  (12,512)  (8,185)  (4,072)  (1,995)  (3,692)
Total accumulated depreciation - nonregulated(c)(d)      (2,498)  ―  ―  ―  ―  (703)  ―
Generation facilities to be retired, net      136  73  63  63  ―  ―  ―
Total net property, plant and equipment    $ 68,558$ 22,826$ 22,697$ 13,062$ 9,360$ 8,126$ 8,320
                    
(a)Includes capitalized leases of $1,844 million, $53 million, $339 million, $150 million, $189 million, $86 million, and $28 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, and Duke Energy Indiana, respectively, primarily in regulated plant. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $49 million, an insignificant amount and $48 million, respectively, of accumulated amortization of capitalized leases.
(b)Includes $857 million, $557 million, $300 million and $300 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(c)Includes accumulated amortization of capitalized leases of $34 million, $3 million, $12 million and $5 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.
(d)Includes gross property, plant and equipment cost of consolidated VIEs of $1,558 million and accumulated depreciation of consolidated VIEs of $103 million at Duke Energy.
                    
Schedule of Excise Taxes
          
  Years Ended December 31,
(in millions) 2013  2012  2011
Duke Energy$ 602 $ 466 $ 293
Duke Energy Carolinas  164   161   153
Progress Energy  304   317   315
Duke Energy Progress  115   113   110
Duke Energy Florida  189   205   205
Duke Energy Ohio  105   102   109
Duke Energy Indiana  29   33   31
          
On July 23, 2013, North Carolina House Bill 998 (HB 998) was signed into law. HB 998 repeals the utility franchise tax effective July 1, 2014. The utility franchise tax was 3.22 percent gross receipts tax on sales of electricity. The result of this change in law will be an annual reduction in excise taxes of approximately $160 million for Duke Energy Carolinas and approximately $110 million for Duke Energy Progress. HB 998 also increases sales tax on electricity from 3 percent to 7 percent effective July 1, 2014. HB 998 requires the NCUC to adjust retail electric rates for the elimination of the utility franchise tax, changes due to the increase in sales tax on electricity, and the resulting change in liability of utility companies under the general franchise tax.
          
  
Schedule Of Unbilled Revenues With Restricted Receivables
       
  December 31,
(in millions)2013 2012
Duke Energy$ 937 $ 920
Duke Energy Carolinas  323   315
Progress Energy  189   187
Duke Energy Progress  120   112
Duke Energy Florida  69   74
Duke Energy Ohio  55   47
Duke Energy Indiana  5   3
       
  
Schedule of Receivable, Allowance for Doubtful Accounts
Allowance for Doubtful Accounts
          
Allowances for doubtful accounts are presented in the following table.
          
  December 31,
(in millions)2013 2012 2011
Allowance for Doubtful Accounts        
Duke Energy$ 30 $ 34 $ 35
Duke Energy Carolinas  3   3   3
Progress Energy  14   16   27
Duke Energy Progress  10   9   9
Duke Energy Florida  4   7   18
Duke Energy Ohio  2   2   16
Duke Energy Indiana  1   1   1
Allowance for Doubtful Accounts - VIEs        
Duke Energy$ 43 $ 44 $ 40
Duke Energy Carolinas  6   6   6
          
  
Schedule of Current and Noncurrent Assets and Liabilities
         
   December 31,
(in millions)Location 2013 2012
Duke Energy       
Accrued compensationCurrent Liabilities $ 621 $ 725
Duke Energy Carolinas       
Accrued compensationCurrent Liabilities $ 198 $ 203 
Collateral liabilitiesCurrent Liabilities   120   105 
Progress Energy       
Customer depositsCurrent Liabilities $ 349 $342 
Accrued compensationCurrent Liabilities   214  304 
Derivative liabilitiesCurrent Liabilities   —   221 
Duke Energy Progress       
Customer depositsCurrent Liabilities $ 129 $ 120 
Accrued compensationCurrent Liabilities   121   160 
Duke Energy Florida       
Customer depositsCurrent Liabilities $ 220 $ 222 
Accrued compensationCurrent Liabilities   65   95 
Derivative liabilitiesCurrent Liabilities   —   127 
Duke Energy Ohio       
Collateral assetsCurrent Assets $ 122 $ 99 
Duke Energy Indiana       
Federal income taxes receivableCurrent Assets $ 56 $ —
Accrued compensation(a)Current Liabilities   25   23 
Collateral liabilities(a)Current Liabilities   40   37 
Derivative liabilitiesCurrent Liabilities   —   63 
         
(a)Does not exceed 5 percent of Total current liabilities on the Consolidated Balance Sheets at December 31, 2012.
         
  
Duke Energy Ohio [Member]
    
Organization And Basis Of Presentation [Line Items]    
Schedule of Unbilled Revenues Sold to CRC
       
  December 31,
(in millions)2013 2012
Duke Energy Ohio$89 $90
Duke Energy Indiana 144  132
       
  
Duke Energy Indiana [Member]
    
Organization And Basis Of Presentation [Line Items]    
Schedule of Unbilled Revenues Sold to CRC
       
  December 31,
(in millions)2013 2012
Duke Energy Ohio$89 $90
Duke Energy Indiana 144  132