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Debt And Credit Facilities (Tables)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Schedule of Debt [Table Text Block]
Summary of Debt and Related Terms                 
  December 31, 2012
(in millions)Weighted Average Interest Rate Duke EnergyDuke Energy CarolinasProgress EnergyProgress Energy CarolinasProgress Energy FloridaDuke Energy OhioDuke Energy Indiana
Unsecured debt, maturing 2013 - 2039 5.44% $ 12,722$ 1,159$ 4,150$ ―$ 150$ 805$ 1,146
Secured debt, maturing 2013 - 2037 3.08%   1,873  300  5  5  ―  ―  ―
First mortgage bonds, maturing 2013 - 2042(a) 5.00%   17,856  6,562  8,775  4,025  4,750  700  1,819
Capital leases, maturing 2013 - 2051(b) 5.19%   1,689  32  339  150  189  35  23
Junior subordinated debt, maturing 2039 7.10%   309  ―  309  ―  ―  ―  ―
Other debt, maturing 2027 4.77%   8  ―  ―  ―  ―  8  ―
Tax-exempt bonds, maturing 2014 - 2041(c) 1.39%   2,357  395  910  669  241  479  573
Non-recourse notes payable of VIEs     312  ―  ―  ―  ―  ―  ―
Notes payable and commercial paper(d) 0.83%   1,195  ―  ―  ―  ―  ―  ―
Money pool borrowings     ―  300  455  364  ―  245  231
Fair value hedge carrying value adjustment     12  10  ―  ―  ―  2  ―
Unamortized debt discount and premium, net(e)     2,185  (17)  (60)  (9)  (10)  (32)  (9)
Total debt(f)     40,518  8,741  14,883  5,204  5,320  2,242  3,783
Short-term notes payable and commercial paper     (745)  ―  ―  ―  ―  ―  ―
Short-term money pool borrowings   ―  ―  (455)  (364)  ―  (245)  (81)
Current maturities of long-term debt     (3,110)  (406)  (843)  (407)  (435)  (261)  (405)
Short-term non-recourse notes payable of VIEs     (312)  ―  ―  ―  ―  ―  ―
Total long-term debt, including long-term debt of VIEs $ 36,351$ 8,335$ 13,585$ 4,433$ 4,885$ 1,736$ 3,297
                   
(a) Substantially all of the Duke Energy Registrants' electric and gas plant in service is mortgaged under mortgage bond indentures.
(b)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
(c) $1.558 billion, $360 million, $910 million, $669 million, $241 million and $288 million were secured by first mortgage bonds at Duke Energy, Duke Energy Carolinas, Progress Energy, Progress Energy Carolinas, Progress Energy Florida and Duke Energy Indiana, respectively, and $231 million, $27 million and $204 million were secured by a letter of credit at Duke Energy, Duke Energy Ohio, and Duke Energy Indiana, respectively.
(d) Includes $450 million that was classified as Long-term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that back-stop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted-average days to maturity was 18 days.
(e) At December 31, 2012, $2.311 billion in purchase accounting adjustments related to the merger with Progress Energy were reflected in the balance for Duke Energy. See Note 2 for additional information.
(f) Includes $451 million of debt for Duke Energy that was denominated in Brazilian Reals and $61 million denominated in Chilean Pesos.
  December 31, 2011
(in millions)Weighted Average Interest Rate Duke EnergyDuke Energy CarolinasProgress EnergyProgress Energy CarolinasProgress Energy FloridaDuke Energy OhioDuke Energy Indiana
Unsecured debt, maturing 2012 - 2039 5.93% $ 8,961$ 2,313$ 4,650$ 500$ 150$ 1,305$ 1,148
Secured debt, maturing 2012 - 2035 3.70%   1,118  300  ―  ―  ―  ―  ―
First mortgage bonds, maturing 2013 - 2041(a) 5.24%   8,182  5,913  7,125  3,025  4,100  700  1,569
Capital leases, maturing 2012 - 2047 8.10%   306  34  211  12  199  44  27
Junior subordinated debt     ―  ―  309  ―  ―  ―  ―
Other debt, maturing 2014 - 2027 5.25%   82  ―  5  5  ―  8  ―
Tax exempt bonds, maturing 2012 - 2041(b) 1.40%   1,515  415  910  669  241  525  574
Non-recourse notes payable of VIEs     273  ―  ―  ―  ―  ―  ―
Notes payable and commercial paper(c) 0.61%   604  ―  671  188  233  ―  ―
Money pool borrowings     ―  300  ―  31  8  ―  450
Fair value hedge carrying value adjustment     19  13  ―  ―  ―  7  ―
Unamortized debt discount and premium, net     (60)  (14)  (58)  (5)  (9)  (34)  (9)
Total debt(d)     21,000  9,274  13,823  4,425  4,922  2,555  3,759
Short-term notes payable and commercial paper     (154)  ―  (671)  (188)  (233)  ―  ―
Short-term money pool borrowings     ―  ―  ―  (31)  (8)  ―  (300)
Current maturities of long-term debt     (1,894)  (1,178)  (961)  (502)  (10)  (507)  (6)
Short-term non-recourse notes payable of VIEs     (273)  ―  ―  ―  ―  ―  ―
Total long-term debt, including long-term debt of VIEs $ 18,679$ 8,096$ 12,191$ 3,704$ 4,671$ 2,048$ 3,453
                   
(a)Substantially all of the Duke Energy Registrants' electric and gas plant in service is mortgaged under the mortgage bond indentures.
(b) $650 million, $360 million, $910 million, $669 million, $241 million and $289 million were secured by first mortgage bonds at Duke Energy, Duke Energy Carolinas, Progress Energy, Progress Energy Carolinas, Progress Energy Florida and Duke Energy Indiana, respectively, and $231 million, $27 million and $204 million were secured by a letter of credit at Duke Energy, Duke Energy Ohio, and Duke Energy Indiana, respectively.
(c) Includes $450 million that was classified as Long-term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that back-stop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted-average days to maturity was 17 days.
(d) Includes $420 million of debt for Duke Energy that was denominated in Brazilian Reals.
Schedule Of Debt Issuances [Table Text Block]
Summary of Significant Debt Issuances 
                        
 The following tables summarize the Duke Energy Registrants' significant debt issuances (in millions).   
                        
      For the year ended December 31, 2012
Issuance DateMaturity DateInterest Rate Duke Energy (Parent) Duke Energy Carolinas Progress Energy (Parent) Progress Energy Carolinas Progress Energy Florida Duke Energy Indiana 
Unsecured Debt:                    
March 2012April 2022 3.15% $ - $ - $ 450 (a)$ - $ - $ - 
August 2012August 2017 1.63%   700 (b)  -   -   -   -   - 
August 2012August 2022 3.05%   500 (b)  -   -   -   -   - 
Secured Debt:                    
April 2012September 2024 2.64%   330 (c)  -   -   -   -   - 
December 2012March 2013 2.77%   203 (d)  -   -   -   -   - 
December 2012March 2013 4.74%   220 (d)  -   -   -   -   - 
December 2012June 2013 1.01%   190 (e)  -   -   -   -   - 
December 2012December 2025 1.56%   200 (e)  -   -   -   -   - 
First Mortgage Bonds:                   - 
March 2012March 2042 4.20%   -   -   -   -   -   250 (f)
May 2012May 2022 2.80%   -   -   -   500 (g)  -   - 
May 2012May 2042 4.10%   -   -   -   500 (g)  -   - 
September 2012September 2042 4.00%   -   650 (h)  -   -   -   - 
November 2012November 2015 0.65%   -   -   -   -   250 (i)  - 
November 2012November 2042 3.85%   -   -   -   -   400 (i)  - 
Total Issuances   $ 2,343 $ 650 $ 450 $ 1,000 $ 650 $ 250 
                        
(a)The net proceeds, along with available cash on hand, were used to repay $450 million 6.85% senior unsecured notes due April 15, 2012.
(b)Proceeds from the issuances were used to repay at maturity $500 million of debentures due September 15, 2012, as well as for general corporate purposes, including the repayment of commercial paper.
(c)Proceeds from the issuance were used to reimburse construction costs for DS Cornerstone, LLC joint venture wind projects. Note was subsequently deconsolidated upon execution of joint venture. See Note 18 for further details.
(d)Proceeds from the issuances were used to fund the existing Los Vientos wind power portfolio.
(e)Debt issuances were executed in connection with the acquisition of Ibener. Both loans are collateralized with cash deposits equal to 101% of the loan amounts. See Note 2 for further details.
(f)Proceeds from the issuance were used to repay a portion of outstanding short-term debt.
(g)Proceeds from the issuances were used to repay at maturity $500 million of 6.50% senior unsecured notes due July 15, 2012 and a portion of Progress Energy Carolinas outstanding commercial paper and notes payable to affiliated companies.
(h)Proceeds from the issuance were used to repay at maturity the $420 million debentures due through November 2012, as well as for general corporate purposes, including the funding of capital expenditures.
(i)Proceeds from the issuances will be used to repay $425 million 4.80% first mortgage bonds due March 1, 2013, as well as for general corporate purposes.
      For the year ended December 31, 2011
Issuance DateMaturity DateInterest Rate Duke Energy (Parent) Duke Energy Carolinas Progress Energy (Parent) Progress Energy Carolinas Progress Energy Florida 
Unsecured Debt:                  
January 2011January 2021 4.40% $ - $ - $ 500 (a)$ - $ - 
August 2011September 2021 3.55%   500 (b)  -   -   -   - 
November 2011November 2016 2.15%   500 (c)  -   -   -   - 
First Mortgage Bonds:                  
May 2011June 2021 3.90%   -   500 (d)  -   -   - 
August 2011September 2021 3.10%   -   -   -   -   300 (e)
September 2011August 2021 3.00%   -   -   -   500 (f)  - 
December 2011December 2016 1.75%   -   350 (g)  -   -   - 
December 2011December 2041 4.25%   -   650 (g)  -   -   - 
Total Issuances   $ 1,000 $ 1,500 $ 500 $ 500 $ 300 
                     
(a)Proceeds from the issuance, along with available cash on hand, were used to repay $700 million 7.10% senior unsecured notes due March 1, 2011.
(b)Proceeds from the issuance were used to repay a portion of commercial paper as it matured, to fund capital expenditures in Duke Energy's unregulated businesses in the U.S. and for general corporate purposes.
(c)Proceeds from the issuance were used to fund capital expenditures in unregulated businesses in the U.S. and for general corporate purposes.
(d)Proceeds from the issuance were used to fund capital expenditures and for general corporate purposes.
(e)Proceeds from the issuance were used to repay a portion of outstanding short-term debt, of which $300 million was used to repay the July 15, 2011 maturity of 6.65% first mortgage bonds.
(f)Proceeds from the issuance were used to repay outstanding short-term debt and the remainder was used for general corporate purposes, including construction expenditures.
(g)Proceeds from the issuances were used to repay $750 million 6.25% senior unsecured notes which matured January 15, 2012, with the remainder to fund capital expenditures and for general corporate purposes.
Schedule Of Current Maturities [Table Text Block]
(in millions)Maturity DateInterest RateDecember 31, 2012
Unsecured Debt:     
Duke Energy (Parent)June 2013 5.650%$ 250
Duke Energy IndianaSeptember 2013 5.000%  400
Secured Debt:     
Duke Energy(a)March 2013 3.796%  423
Duke Energy(b)June 2013 1.009%  190
First Mortgage Bonds:     
Duke Energy Carolinas November 2013 5.750%  400
Progress Energy CarolinasSeptember 2013 5.125%  400
Progress Energy FloridaMarch 2013 4.800%  425
Duke Energy OhioJune 2013 2.100%  250
Other     372
Current maturities of long-term debt   $ 3,110
       
(a)Represents a construction loan related to a renewable project that will be converted to a term loan once construction in complete and requirements to convert are fulfilled.
(b)Notes are fully offset with cash collateral, which is recorded in Other current assets in the Consolidated Balance Sheets as of December 31, 2012.
  
Schedule of Maturities of Long-term Debt [Table Text Block]
  December 31, 2012
(in millions)Duke Energy(a) Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 3,098 $ 406 $ 843 $ 407 $ 435 $ 261 $ 405
2014  2,196   346   312   2   11   47   5
2015  2,478   506   1,262   701   561   7   5
2016  2,184   655   313   2   11   56   480
2017  1,321   116   311   51   261   2   3
Thereafter  25,873   6,712   11,387   3,677   4,041   1,624   2,804
Total long-term debt, including current maturities$ 37,150 $ 8,741 $ 14,428 $ 4,840 $ 5,320 $ 1,997 $ 3,702
                      
(a)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
  
Schedule Of Line Of Credit Facilities
   December 31, 2012
(in millions) Duke Energy (Parent) Duke Energy Carolinas Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana Total Duke Energy
Facility size$ 1,750$ 1,250$ 750$ 750$ 750$ 750$ 6,000
Reduction to backstop issuances              
 Notes payable and commercial paper  (195)  (300)  ―  ―  (104)  (201)  (800)
 Outstanding letters of credit  (50)  (7)  (2)  (1)  ―  ―  (60)
 Tax-exempt bonds  ―  (75)  ―  ―  (84)  (81)  (240)
Available capacity$ 1,505$ 868$ 748$ 749$ 562$ 468$ 4,900
  
Duke Energy Carolinas [Member]
    
Debt Instrument [Line Items]    
Schedule Of Debt Issuances [Table Text Block]  
      For the year ended December 31, 2011
Issuance DateMaturity DateInterest Rate Duke Energy (Parent) Duke Energy Carolinas Progress Energy (Parent) Progress Energy Carolinas Progress Energy Florida 
Unsecured Debt:                  
January 2011January 2021 4.40% $ - $ - $ 500 (a)$ - $ - 
August 2011September 2021 3.55%   500 (b)  -   -   -   - 
November 2011November 2016 2.15%   500 (c)  -   -   -   - 
First Mortgage Bonds:                  
May 2011June 2021 3.90%   -   500 (d)  -   -   - 
August 2011September 2021 3.10%   -   -   -   -   300 (e)
September 2011August 2021 3.00%   -   -   -   500 (f)  - 
December 2011December 2016 1.75%   -   350 (g)  -   -   - 
December 2011December 2041 4.25%   -   650 (g)  -   -   - 
Total Issuances   $ 1,000 $ 1,500 $ 500 $ 500 $ 300 
                     
(a)Proceeds from the issuance, along with available cash on hand, were used to repay $700 million 7.10% senior unsecured notes due March 1, 2011.
(b)Proceeds from the issuance were used to repay a portion of commercial paper as it matured, to fund capital expenditures in Duke Energy's unregulated businesses in the U.S. and for general corporate purposes.
(c)Proceeds from the issuance were used to fund capital expenditures in unregulated businesses in the U.S. and for general corporate purposes.
(d)Proceeds from the issuance were used to fund capital expenditures and for general corporate purposes.
(e)Proceeds from the issuance were used to repay a portion of outstanding short-term debt, of which $300 million was used to repay the July 15, 2011 maturity of 6.65% first mortgage bonds.
(f)Proceeds from the issuance were used to repay outstanding short-term debt and the remainder was used for general corporate purposes, including construction expenditures.
(g)Proceeds from the issuances were used to repay $750 million 6.25% senior unsecured notes which matured January 15, 2012, with the remainder to fund capital expenditures and for general corporate purposes.
Schedule of Maturities of Long-term Debt [Table Text Block]
  December 31, 2012
(in millions)Duke Energy(a) Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 3,098 $ 406 $ 843 $ 407 $ 435 $ 261 $ 405
2014  2,196   346   312   2   11   47   5
2015  2,478   506   1,262   701   561   7   5
2016  2,184   655   313   2   11   56   480
2017  1,321   116   311   51   261   2   3
Thereafter  25,873   6,712   11,387   3,677   4,041   1,624   2,804
Total long-term debt, including current maturities$ 37,150 $ 8,741 $ 14,428 $ 4,840 $ 5,320 $ 1,997 $ 3,702
                      
(a)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
  
Schedule Of Line Of Credit Facilities
   December 31, 2012
(in millions) Duke Energy (Parent) Duke Energy Carolinas Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana Total Duke Energy
Facility size$ 1,750$ 1,250$ 750$ 750$ 750$ 750$ 6,000
Reduction to backstop issuances              
 Notes payable and commercial paper  (195)  (300)  ―  ―  (104)  (201)  (800)
 Outstanding letters of credit  (50)  (7)  (2)  (1)  ―  ―  (60)
 Tax-exempt bonds  ―  (75)  ―  ―  (84)  (81)  (240)
Available capacity$ 1,505$ 868$ 748$ 749$ 562$ 468$ 4,900
  
Progress Energy [Member]
    
Debt Instrument [Line Items]    
Schedule Of Debt Issuances [Table Text Block]  
      For the year ended December 31, 2011
Issuance DateMaturity DateInterest Rate Duke Energy (Parent) Duke Energy Carolinas Progress Energy (Parent) Progress Energy Carolinas Progress Energy Florida 
Unsecured Debt:                  
January 2011January 2021 4.40% $ - $ - $ 500 (a)$ - $ - 
August 2011September 2021 3.55%   500 (b)  -   -   -   - 
November 2011November 2016 2.15%   500 (c)  -   -   -   - 
First Mortgage Bonds:                  
May 2011June 2021 3.90%   -   500 (d)  -   -   - 
August 2011September 2021 3.10%   -   -   -   -   300 (e)
September 2011August 2021 3.00%   -   -   -   500 (f)  - 
December 2011December 2016 1.75%   -   350 (g)  -   -   - 
December 2011December 2041 4.25%   -   650 (g)  -   -   - 
Total Issuances   $ 1,000 $ 1,500 $ 500 $ 500 $ 300 
                     
(a)Proceeds from the issuance, along with available cash on hand, were used to repay $700 million 7.10% senior unsecured notes due March 1, 2011.
(b)Proceeds from the issuance were used to repay a portion of commercial paper as it matured, to fund capital expenditures in Duke Energy's unregulated businesses in the U.S. and for general corporate purposes.
(c)Proceeds from the issuance were used to fund capital expenditures in unregulated businesses in the U.S. and for general corporate purposes.
(d)Proceeds from the issuance were used to fund capital expenditures and for general corporate purposes.
(e)Proceeds from the issuance were used to repay a portion of outstanding short-term debt, of which $300 million was used to repay the July 15, 2011 maturity of 6.65% first mortgage bonds.
(f)Proceeds from the issuance were used to repay outstanding short-term debt and the remainder was used for general corporate purposes, including construction expenditures.
(g)Proceeds from the issuances were used to repay $750 million 6.25% senior unsecured notes which matured January 15, 2012, with the remainder to fund capital expenditures and for general corporate purposes.
Schedule of Maturities of Long-term Debt [Table Text Block]
  December 31, 2012
(in millions)Duke Energy(a) Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 3,098 $ 406 $ 843 $ 407 $ 435 $ 261 $ 405
2014  2,196   346   312   2   11   47   5
2015  2,478   506   1,262   701   561   7   5
2016  2,184   655   313   2   11   56   480
2017  1,321   116   311   51   261   2   3
Thereafter  25,873   6,712   11,387   3,677   4,041   1,624   2,804
Total long-term debt, including current maturities$ 37,150 $ 8,741 $ 14,428 $ 4,840 $ 5,320 $ 1,997 $ 3,702
                      
(a)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
  
Schedule Of Line Of Credit Facilities
   December 31, 2012
(in millions) Duke Energy (Parent) Duke Energy Carolinas Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana Total Duke Energy
Facility size$ 1,750$ 1,250$ 750$ 750$ 750$ 750$ 6,000
Reduction to backstop issuances              
 Notes payable and commercial paper  (195)  (300)  ―  ―  (104)  (201)  (800)
 Outstanding letters of credit  (50)  (7)  (2)  (1)  ―  ―  (60)
 Tax-exempt bonds  ―  (75)  ―  ―  (84)  (81)  (240)
Available capacity$ 1,505$ 868$ 748$ 749$ 562$ 468$ 4,900
  
Progress Energy Carolinas [Member]
    
Debt Instrument [Line Items]    
Schedule Of Debt Issuances [Table Text Block]  
      For the year ended December 31, 2011
Issuance DateMaturity DateInterest Rate Duke Energy (Parent) Duke Energy Carolinas Progress Energy (Parent) Progress Energy Carolinas Progress Energy Florida 
Unsecured Debt:                  
January 2011January 2021 4.40% $ - $ - $ 500 (a)$ - $ - 
August 2011September 2021 3.55%   500 (b)  -   -   -   - 
November 2011November 2016 2.15%   500 (c)  -   -   -   - 
First Mortgage Bonds:                  
May 2011June 2021 3.90%   -   500 (d)  -   -   - 
August 2011September 2021 3.10%   -   -   -   -   300 (e)
September 2011August 2021 3.00%   -   -   -   500 (f)  - 
December 2011December 2016 1.75%   -   350 (g)  -   -   - 
December 2011December 2041 4.25%   -   650 (g)  -   -   - 
Total Issuances   $ 1,000 $ 1,500 $ 500 $ 500 $ 300 
                     
(a)Proceeds from the issuance, along with available cash on hand, were used to repay $700 million 7.10% senior unsecured notes due March 1, 2011.
(b)Proceeds from the issuance were used to repay a portion of commercial paper as it matured, to fund capital expenditures in Duke Energy's unregulated businesses in the U.S. and for general corporate purposes.
(c)Proceeds from the issuance were used to fund capital expenditures in unregulated businesses in the U.S. and for general corporate purposes.
(d)Proceeds from the issuance were used to fund capital expenditures and for general corporate purposes.
(e)Proceeds from the issuance were used to repay a portion of outstanding short-term debt, of which $300 million was used to repay the July 15, 2011 maturity of 6.65% first mortgage bonds.
(f)Proceeds from the issuance were used to repay outstanding short-term debt and the remainder was used for general corporate purposes, including construction expenditures.
(g)Proceeds from the issuances were used to repay $750 million 6.25% senior unsecured notes which matured January 15, 2012, with the remainder to fund capital expenditures and for general corporate purposes.
Schedule of Maturities of Long-term Debt [Table Text Block]
  December 31, 2012
(in millions)Duke Energy(a) Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 3,098 $ 406 $ 843 $ 407 $ 435 $ 261 $ 405
2014  2,196   346   312   2   11   47   5
2015  2,478   506   1,262   701   561   7   5
2016  2,184   655   313   2   11   56   480
2017  1,321   116   311   51   261   2   3
Thereafter  25,873   6,712   11,387   3,677   4,041   1,624   2,804
Total long-term debt, including current maturities$ 37,150 $ 8,741 $ 14,428 $ 4,840 $ 5,320 $ 1,997 $ 3,702
                      
(a)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
  
Schedule Of Line Of Credit Facilities
   December 31, 2012
(in millions) Duke Energy (Parent) Duke Energy Carolinas Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana Total Duke Energy
Facility size$ 1,750$ 1,250$ 750$ 750$ 750$ 750$ 6,000
Reduction to backstop issuances              
 Notes payable and commercial paper  (195)  (300)  ―  ―  (104)  (201)  (800)
 Outstanding letters of credit  (50)  (7)  (2)  (1)  ―  ―  (60)
 Tax-exempt bonds  ―  (75)  ―  ―  (84)  (81)  (240)
Available capacity$ 1,505$ 868$ 748$ 749$ 562$ 468$ 4,900
  
Progress Energy Florida [Member]
    
Debt Instrument [Line Items]    
Schedule Of Debt Issuances [Table Text Block]  
      For the year ended December 31, 2011
Issuance DateMaturity DateInterest Rate Duke Energy (Parent) Duke Energy Carolinas Progress Energy (Parent) Progress Energy Carolinas Progress Energy Florida 
Unsecured Debt:                  
January 2011January 2021 4.40% $ - $ - $ 500 (a)$ - $ - 
August 2011September 2021 3.55%   500 (b)  -   -   -   - 
November 2011November 2016 2.15%   500 (c)  -   -   -   - 
First Mortgage Bonds:                  
May 2011June 2021 3.90%   -   500 (d)  -   -   - 
August 2011September 2021 3.10%   -   -   -   -   300 (e)
September 2011August 2021 3.00%   -   -   -   500 (f)  - 
December 2011December 2016 1.75%   -   350 (g)  -   -   - 
December 2011December 2041 4.25%   -   650 (g)  -   -   - 
Total Issuances   $ 1,000 $ 1,500 $ 500 $ 500 $ 300 
                     
(a)Proceeds from the issuance, along with available cash on hand, were used to repay $700 million 7.10% senior unsecured notes due March 1, 2011.
(b)Proceeds from the issuance were used to repay a portion of commercial paper as it matured, to fund capital expenditures in Duke Energy's unregulated businesses in the U.S. and for general corporate purposes.
(c)Proceeds from the issuance were used to fund capital expenditures in unregulated businesses in the U.S. and for general corporate purposes.
(d)Proceeds from the issuance were used to fund capital expenditures and for general corporate purposes.
(e)Proceeds from the issuance were used to repay a portion of outstanding short-term debt, of which $300 million was used to repay the July 15, 2011 maturity of 6.65% first mortgage bonds.
(f)Proceeds from the issuance were used to repay outstanding short-term debt and the remainder was used for general corporate purposes, including construction expenditures.
(g)Proceeds from the issuances were used to repay $750 million 6.25% senior unsecured notes which matured January 15, 2012, with the remainder to fund capital expenditures and for general corporate purposes.
Schedule of Maturities of Long-term Debt [Table Text Block]
  December 31, 2012
(in millions)Duke Energy(a) Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 3,098 $ 406 $ 843 $ 407 $ 435 $ 261 $ 405
2014  2,196   346   312   2   11   47   5
2015  2,478   506   1,262   701   561   7   5
2016  2,184   655   313   2   11   56   480
2017  1,321   116   311   51   261   2   3
Thereafter  25,873   6,712   11,387   3,677   4,041   1,624   2,804
Total long-term debt, including current maturities$ 37,150 $ 8,741 $ 14,428 $ 4,840 $ 5,320 $ 1,997 $ 3,702
                      
(a)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
  
Schedule Of Line Of Credit Facilities
   December 31, 2012
(in millions) Duke Energy (Parent) Duke Energy Carolinas Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana Total Duke Energy
Facility size$ 1,750$ 1,250$ 750$ 750$ 750$ 750$ 6,000
Reduction to backstop issuances              
 Notes payable and commercial paper  (195)  (300)  ―  ―  (104)  (201)  (800)
 Outstanding letters of credit  (50)  (7)  (2)  (1)  ―  ―  (60)
 Tax-exempt bonds  ―  (75)  ―  ―  (84)  (81)  (240)
Available capacity$ 1,505$ 868$ 748$ 749$ 562$ 468$ 4,900
  
Duke Energy Ohio [Member]
    
Debt Instrument [Line Items]    
Schedule of Maturities of Long-term Debt [Table Text Block]
  December 31, 2012
(in millions)Duke Energy(a) Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 3,098 $ 406 $ 843 $ 407 $ 435 $ 261 $ 405
2014  2,196   346   312   2   11   47   5
2015  2,478   506   1,262   701   561   7   5
2016  2,184   655   313   2   11   56   480
2017  1,321   116   311   51   261   2   3
Thereafter  25,873   6,712   11,387   3,677   4,041   1,624   2,804
Total long-term debt, including current maturities$ 37,150 $ 8,741 $ 14,428 $ 4,840 $ 5,320 $ 1,997 $ 3,702
                      
(a)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
  
Schedule Of Line Of Credit Facilities
   December 31, 2012
(in millions) Duke Energy (Parent) Duke Energy Carolinas Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana Total Duke Energy
Facility size$ 1,750$ 1,250$ 750$ 750$ 750$ 750$ 6,000
Reduction to backstop issuances              
 Notes payable and commercial paper  (195)  (300)  ―  ―  (104)  (201)  (800)
 Outstanding letters of credit  (50)  (7)  (2)  (1)  ―  ―  (60)
 Tax-exempt bonds  ―  (75)  ―  ―  (84)  (81)  (240)
Available capacity$ 1,505$ 868$ 748$ 749$ 562$ 468$ 4,900
  
Duke Energy Indiana [Member]
    
Debt Instrument [Line Items]    
Schedule of Maturities of Long-term Debt [Table Text Block]
  December 31, 2012
(in millions)Duke Energy(a) Duke Energy Carolinas Progress Energy Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana
2013$ 3,098 $ 406 $ 843 $ 407 $ 435 $ 261 $ 405
2014  2,196   346   312   2   11   47   5
2015  2,478   506   1,262   701   561   7   5
2016  2,184   655   313   2   11   56   480
2017  1,321   116   311   51   261   2   3
Thereafter  25,873   6,712   11,387   3,677   4,041   1,624   2,804
Total long-term debt, including current maturities$ 37,150 $ 8,741 $ 14,428 $ 4,840 $ 5,320 $ 1,997 $ 3,702
                      
(a)At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
  
Schedule Of Line Of Credit Facilities
   December 31, 2012
(in millions) Duke Energy (Parent) Duke Energy Carolinas Progress Energy Carolinas Progress Energy Florida Duke Energy Ohio Duke Energy Indiana Total Duke Energy
Facility size$ 1,750$ 1,250$ 750$ 750$ 750$ 750$ 6,000
Reduction to backstop issuances              
 Notes payable and commercial paper  (195)  (300)  ―  ―  (104)  (201)  (800)
 Outstanding letters of credit  (50)  (7)  (2)  (1)  ―  ―  (60)
 Tax-exempt bonds  ―  (75)  ―  ―  (84)  (81)  (240)
Available capacity$ 1,505$ 868$ 748$ 749$ 562$ 468$ 4,900