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Debt and Credit Facilities (Summary of Debt Issuances) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
January 2013 5.125% Junior Subordinated Debentures Maturing January 2073 [Member]
Unsecured Debt [Member]
Dec. 31, 2013
June 2013 2.100% Senior Notes Maturing June 2018 [Member]
Unsecured Debt [Member]
Dec. 31, 2013
August 2013 11.000% Non Convertible Debentures Maturing August 2018 [Member]
Unsecured Debt [Member]
Dec. 31, 2013
October 2013 3.950% Senior Notes Maturing October 2023 [Member]
Unsecured Debt [Member]
Dec. 31, 2013
February 2013 2.043% Term Loans Maturing December 2030 [Member]
Secured Debt [Member]
Dec. 31, 2013
February 2013 4.740% Term Loans Maturing June 2037 [Member]
Secured Debt [Member]
Dec. 31, 2013
April 2013 5.456% Non Recourse Secured Credit Facility Maturing April 2026 [Member]
Bridge Loan [Member]
Dec. 31, 2013
April 2013 5.456% Non Recourse Secured Credit Facility Maturing April 2026 [Member]
Secured Debt [Member]
Dec. 31, 2013
December 2013 0.852% Secured ARS Maturing December 2016 [Member]
Dec. 31, 2013
March 2013 4.100% First Mortgage Bonds Maturing March 2043 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
July 2013 4.900% First Mortgage Bonds Maturing July 2043 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
July 2013 0.619% First Mortgage Bonds Maturing July 2016 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
September 2013 3.800% First Mortgage Bonds Maturing September 2023 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
September 2013 0.400% First Mortgage Bonds Maturing March 2015 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
March 2012 3.15% Unsecured Maturing April 2022 [Member]
Unsecured Debt [Member]
Dec. 31, 2012
August 2012 1.63% Senior Notes Maturing August 2017 [Member]
Unsecured Debt [Member]
Dec. 31, 2012
August 2012 3.05% Senior Notes Maturing August 2022 [Member]
Unsecured Debt [Member]
Dec. 31, 2012
April 2012 2.64% Secured Maturing September 2024 [Member]
Secured Debt [Member]
Dec. 31, 2012
December 2012 2.77% Secured Maturing March 2013 [Member]
Secured Debt [Member]
Dec. 31, 2012
December 2012 4.74% Secured Maturing March 2013 [Member]
Secured Debt [Member]
Dec. 31, 2012
December 2012 1.01% Secured Maturing June 2013 [Member]
Secured Debt [Member]
Dec. 31, 2012
December 2012 1.56% Secured Maturing December 2025 [Member]
Secured Debt [Member]
Dec. 31, 2012
March 2012 4.20% First Mortgage Bonds Maturing March 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
May 2012 2.80% First Mortgage Bonds Maturing May 2022 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
May 2012 4.10% First Mortgage Bonds Maturing May 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
September 2012 4.00% First Mortgage Bonds Maturing September 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
November 2012 0.65% First Mortgage Bonds Maturing November 2015 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
November 2012 3.85%First Mortgage Bonds Maturing November 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Duke Energy Carolinas [Member]
Dec. 31, 2012
Duke Energy Carolinas [Member]
September 2012 4.00% First Mortgage Bonds Maturing September 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
Progress Energy [Member]
January 2013 5.125% Junior Subordinated Debentures Maturing January 2073 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2013
Duke Energy Progress [Member]
Dec. 31, 2012
Duke Energy Progress [Member]
Dec. 31, 2013
Duke Energy Progress [Member]
December 2013 0.852% Secured ARS Maturing December 2016 [Member]
Dec. 31, 2013
Duke Energy Progress [Member]
March 2013 4.100% First Mortgage Bonds Maturing March 2043 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Duke Energy Progress [Member]
May 2012 2.80% First Mortgage Bonds Maturing May 2022 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Duke Energy Progress [Member]
May 2012 4.10% First Mortgage Bonds Maturing May 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Duke Energy Florida [Member]
Dec. 31, 2012
Duke Energy Florida [Member]
November 2012 0.65% First Mortgage Bonds Maturing November 2015 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Duke Energy Florida [Member]
November 2012 3.85%First Mortgage Bonds Maturing November 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
Duke Energy Ohio [Member]
Dec. 31, 2013
Duke Energy Ohio [Member]
September 2013 3.800% First Mortgage Bonds Maturing September 2023 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
Duke Energy Ohio [Member]
September 2013 0.400% First Mortgage Bonds Maturing March 2015 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
Duke Energy Indiana [Member]
Dec. 31, 2012
Duke Energy Indiana [Member]
Dec. 31, 2013
Duke Energy Indiana [Member]
July 2013 4.900% First Mortgage Bonds Maturing July 2043 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
Duke Energy Indiana [Member]
July 2013 0.619% First Mortgage Bonds Maturing July 2016 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2012
Duke Energy Indiana [Member]
March 2012 4.20% First Mortgage Bonds Maturing March 2042 [Member]
First Mortgage Bonds [Member]
Dec. 31, 2013
Parent Company [Member]
Dec. 31, 2012
Parent Company [Member]
Dec. 31, 2013
Parent Company [Member]
January 2013 5.125% Junior Subordinated Debentures Maturing January 2073 [Member]
Unsecured Debt [Member]
Dec. 31, 2013
Parent Company [Member]
June 2013 2.100% Senior Notes Maturing June 2018 [Member]
Unsecured Debt [Member]
Dec. 31, 2013
Parent Company [Member]
October 2013 3.950% Senior Notes Maturing October 2023 [Member]
Unsecured Debt [Member]
Dec. 31, 2012
Parent Company [Member]
August 2012 1.63% Senior Notes Maturing August 2017 [Member]
Unsecured Debt [Member]
Dec. 31, 2012
Parent Company [Member]
August 2012 3.05% Senior Notes Maturing August 2022 [Member]
Unsecured Debt [Member]
Dec. 31, 2012
Parent Company [Member]
April 2012 2.64% Secured Maturing September 2024 [Member]
Secured Debt [Member]
Dec. 31, 2012
Parent Company [Member]
December 2012 2.77% Secured Maturing March 2013 [Member]
Secured Debt [Member]
Dec. 31, 2012
Parent Company [Member]
December 2012 4.74% Secured Maturing March 2013 [Member]
Secured Debt [Member]
Dec. 31, 2012
Parent Company [Member]
December 2012 1.01% Secured Maturing June 2013 [Member]
Secured Debt [Member]
Dec. 31, 2012
Parent Company [Member]
December 2012 1.56% Secured Maturing December 2025 [Member]
Secured Debt [Member]
Dec. 31, 2012
PGN Parent [Member]
Dec. 31, 2012
PGN Parent [Member]
March 2012 3.15% Unsecured Maturing April 2022 [Member]
Unsecured Debt [Member]
Debt Instrument [Line Items]                                                                                                                                
Debt issuance date     Jan. 31, 2013 Jun. 30, 2013 Aug. 31, 2013 Oct. 31, 2013 Feb. 28, 2013 Feb. 28, 2013   Apr. 30, 2013 Dec. 20, 2013 Mar. 31, 2013 Jul. 31, 2013 Jul. 31, 2013 Sep. 30, 2013 Sep. 30, 2013 Mar. 31, 2012 Aug. 31, 2012 Aug. 31, 2012 Apr. 30, 2012 Dec. 31, 2012 Dec. 31, 2012 Dec. 31, 2012 Dec. 31, 2012 Mar. 31, 2012 May 30, 2012 May 30, 2012 Sep. 30, 2012 Nov. 30, 2012 Nov. 30, 2012   Sep. 30, 2012       Dec. 20, 2013 Mar. 31, 2013 May 30, 2012 May 30, 2012   Nov. 30, 2012 Nov. 30, 2012   Sep. 30, 2013 Sep. 30, 2013     Jul. 31, 2013 Jul. 31, 2013 Mar. 31, 2012     Jan. 31, 2013 Jun. 30, 2013 Oct. 31, 2013 Aug. 31, 2012 Aug. 31, 2012 Apr. 30, 2012 Dec. 31, 2012 Dec. 31, 2012 Dec. 31, 2012 Dec. 31, 2012   Mar. 31, 2012
Debt maturity date     Jan. 31, 2073 Jun. 30, 2018   Oct. 31, 2023 Dec. 31, 2030 Jun. 30, 2037   Apr. 30, 2026 Dec. 20, 2016 Mar. 31, 2043 Jul. 31, 2043 Jul. 31, 2016 Sep. 30, 2023 Mar. 31, 2015 Apr. 30, 2022 Aug. 31, 2017 Aug. 31, 2022 Sep. 30, 2024 Mar. 31, 2013 Mar. 31, 2013 Jun. 30, 2013 Dec. 31, 2025 Mar. 31, 2042 May 30, 2022 May 30, 2042 Sep. 30, 2042 Nov. 30, 2015 Nov. 30, 2042   Sep. 30, 2042       Dec. 20, 2016 Mar. 31, 2043 May 30, 2022 May 30, 2042   Nov. 30, 2015 Nov. 30, 2042   Sep. 30, 2023 Mar. 31, 2015     Jul. 31, 2043 Jul. 31, 2016 Mar. 31, 2042     Jan. 31, 2073 Jun. 30, 2018 Oct. 31, 2023 Aug. 31, 2017 Aug. 31, 2022 Sep. 30, 2024 Mar. 31, 2013 Mar. 31, 2013 Jun. 30, 2013 Dec. 31, 2025   Apr. 30, 2022
Debt maturity date, start         Aug. 31, 2018                                                                                                                      
Debt maturity date, end         Aug. 31, 2023                                                                                                                      
Debt issuances $ 4,023 $ 5,343 $ 500 [1] $ 500 [2] $ 220 [3],[4] $ 400 [5] $ 203 [6],[7] $ 220 [6]   $ 230 [8] $ 300 [9] $ 500 [10] $ 350 [11] $ 150 [11],[12] $ 300 [13] $ 150 [13],[14] $ 450 [15] $ 700 [16] $ 500 [16] $ 330 [17] $ 203 [18] $ 220 [18] $ 190 [19] $ 200 [19] $ 250 [20] $ 500 [21] $ 500 [21] $ 650 [22] $ 250 [23] $ 400 [23] $ 650 $ 650 [22]   $ 800 $ 1,000 $ 300 [9] $ 500 [10] $ 500 [21] $ 500 [21] $ 650 $ 250 [23] $ 400 [23] $ 450 $ 300 [13] $ 150 [13],[14] $ 500 $ 250 $ 350 [11] $ 150 [11],[12] $ 250 [20] $ 1,400 $ 2,343 $ 500 [1] $ 500 [2] $ 400 [5] $ 700 [16] $ 500 [16] $ 330 [17] $ 203 [18] $ 220 [18] $ 190 [19] $ 200 [19] $ 450 $ 450 [15]
Interest rate     5.125% 2.10% 11.00% 3.95% 2.043% 4.74%   5.456% 0.852% 4.10% 4.90% 0.619% 3.80% 0.40% 3.15% 1.63% 3.05% 2.64% 2.77% 4.74% 1.01% 1.56% 4.20% 2.80% 4.10% 4.00% 0.65% 3.85%   4.00% 7.10%     0.852% 4.10% 2.80% 4.10%   0.65% 3.85%   3.80% 0.40%     4.90% 0.619% 4.20%     5.125% 2.10% 3.95% 1.63% 3.05% 2.64% 2.77% 4.74% 1.01% 1.56%   3.15%
Debt instrument, call date, earliest     Jan. 31, 2018                                                                                                   Jan. 31, 2018                      
Payments for the redemption of debt       250 200       190       400   250   450 500 500             500 500 420 425 425   420 300         500 500   425 425   250       400           250   500 500             450
Percentage of debt hedged by interest rate derivatives             95.00%     75.00%                                                                                                            
Incremental debt proceeds                   $ 40                                                                                                            
Fixed credit spread                           0.35%   0.14%                                                         0.14%       0.35%                              
[1] Callable after January 2018 at par. Proceeds were used to redeem the $300 million 7.10% Cumulative Quarterly Income Preferred Securities (QUIPS) and to repay a portion of outstanding commercial paper and for general corporate purposes. See Note 17 for additional information about the QUIPS.
[2] Proceeds were used to repay $250 million of current maturities and for general corporate purposes, including the repayment of outstanding commercial paper.
[3] Proceeds were used to repay $200 million of current maturities. The maturity date included above applies to half of the instrument. The remaining half matures in August 2018.
[4] The debt is floating rate based on a consumer price index and an overnight funds rate in Brazil. The debt is denominated in Brazilian Real.
[5] Proceeds were used to repay commercial paper as well as for general corporate purposes.
[6] Represents the conversion of construction loans related to a renewable energy project issued in December 2012 to term loans. No cash proceeds were received in conjunction with the conversion. The term loans have varying maturity dates. The maturity date presented represents the latest date for all components of the respective loans.
[7] The debt is floating rate. Duke Energy has entered into a pay fixed-receive floating interest rate swap for 95 percent of the loans.
[8] Represents the conversion of a $190 million bridge loan issued in conjunction with the acquisition of Ibener in December 2012. Duke Energy received incremental proceeds of $40 million upon conversion of the bridge loan. The debt is floating rate and is denominated in U.S. dollars. Duke Energy has entered into a pay fixed-receive floating interest rate swap for 75 percent of the loan.
[9] Relates to the securitization of accounts receivable at a subsidiary of Duke Energy Progress; the proceeds were used to repay short-term debt. See Note 17 for further details.
[10] Proceeds were used to repay notes payable to affiliated companies as well as for general corporate purposes.
[11] Proceeds were used to repay $400 million of current maturities.
[12] The debt is floating rate based on 3-month London Interbank Offered Rate (LIBOR) and a fixed credit spread of 35 basis points.
[13] Proceeds were used for general corporate purposes including the repayment of short-term notes payable, a portion of which was incurred to fund the retirement of $250 million of first mortgage bonds that matured in the first half of 2013.
[14] The debt is floating rate based on 3-month LIBOR plus a fixed spread of 14 basis points.
[15] Proceeds were used to repay current maturities of $450 million.
[16] Proceeds were used to repay current maturities of $500 million, as well as for general corporate purposes, including the repayment of commercial paper.
[17] Proceeds were used to reimburse construction costs for DS Cornerstone, LLC joint venture wind projects. Debt was subsequently deconsolidated upon execution of a joint venture. See Note 17 for further details.
[18] Proceeds were used to fund the existing Los Vientos wind power portfolio.
[19] Debt issuances were executed in connection with the acquisition of Ibener. Both loans were collateralized with cash deposits equal to 101 percent of the loan amounts. See Note 2 for further details.
[20] Proceeds were used to repay a portion of outstanding short-term debt.
[21] Proceeds were used to repay current maturities of $500 million, a portion of outstanding commercial paper and notes payable to affiliated companies.
[22] Proceeds were used to repay current maturities of $420 million, as well as for general corporate purposes, including the funding of capital expenditures.
[23] Proceeds will be used to repay current maturities of $425 million, as well as for general corporate purposes.