v2.4.0.8
Debt and Credit Facilities (Summary of Debt Issuances) (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
April 2014 3.75% Senior Unsecured Notes Maturing April 2024 [Member]
Unsecured Debt [Member]
Sep. 30, 2014
April 2014 0.612% Senior Unsecured Floating Notes Maturing April 2017 [Member]
Unsecured Debt [Member]
Sep. 30, 2014
June 2014 11.870% Senior Unsecured Floating Notes Maturing May 2019 [Member]
Unsecured Debt [Member]
Sep. 30, 2014
June 2014 13.680% Senior Unsecured Floating Notes Maturing May 2021 [Member]
Unsecured Debt [Member]
Sep. 30, 2014
March 2014 0.854% Secured Credit Facility Maturing March 2017 [Member]
Secured Debt [Member]
Sep. 30, 2014
July 2014 5.340% Secured Debt Maturing July 2036 [Member]
Secured Debt [Member]
Sep. 30, 2014
March 2014 4.375% First Mortgage Bonds Maturing March 2044 [Member]
First Mortgage Bonds [Member]
Sep. 30, 2014
March 2014 0.433% First Mortgage Bonds Maturing March 2017 [Member]
First Mortgage Bonds [Member]
Sep. 30, 2014
Parent Company [Member]
Apr. 30, 2014
Parent Company [Member]
Unsecured Debt [Member]
Sep. 30, 2014
Parent Company [Member]
April 2014 3.75% Senior Unsecured Notes Maturing April 2024 [Member]
Unsecured Debt [Member]
Sep. 30, 2014
Parent Company [Member]
April 2014 0.612% Senior Unsecured Floating Notes Maturing April 2017 [Member]
Unsecured Debt [Member]
Sep. 30, 2014
Duke Energy Progress [Member]
Sep. 30, 2014
Duke Energy Progress [Member]
March 2014 4.375% First Mortgage Bonds Maturing March 2044 [Member]
First Mortgage Bonds [Member]
Sep. 30, 2014
Duke Energy Progress [Member]
March 2014 0.433% First Mortgage Bonds Maturing March 2017 [Member]
First Mortgage Bonds [Member]
Sep. 30, 2014
Duke Energy Florida [Member]
Sep. 30, 2014
Duke Energy Florida [Member]
March 2014 0.854% Secured Credit Facility Maturing March 2017 [Member]
Secured Debt [Member]
Sep. 30, 2014
Duke Energy Ohio [Member]
Unsecured Debt [Member]
Sep. 30, 2014
International Energy [Member]
Unsecured Debt [Member]
Debt Instrument [Line Items]                                        
Repayments of debt                                     $ 402,000,000 $ 196,000,000
Debt issuance date   Apr. 01, 2014 Apr. 01, 2014 Jun. 01, 2014 Jun. 01, 2014 Mar. 01, 2014 Jul. 01, 2014 Mar. 01, 2014 Mar. 01, 2014     Apr. 01, 2014 Apr. 01, 2014   Mar. 01, 2014 Mar. 01, 2014   Mar. 01, 2014    
Debt maturity date   Apr. 30, 2024 Apr. 30, 2017 May 31, 2019 May 31, 2021 Mar. 31, 2017 Jul. 31, 2036 Mar. 31, 2044 Mar. 31, 2017     Apr. 30, 2024 Apr. 30, 2017   Mar. 31, 2044 Mar. 31, 2017   Mar. 31, 2017    
Interest rate   3.75% 0.612% 11.87% 13.68% 0.854% 5.34% 4.375% 0.433%     3.75% 0.612%   4.375% 0.433%   0.854%    
Debt issuances $ 2,222,000,000 $ 600,000,000 [1] $ 400,000,000 [1] $ 108,000,000 [2] $ 110,000,000 [2] $ 225,000,000 [3] $ 129,000,000 [4] $ 400,000,000 [5] $ 250,000,000 [5] $ 1,000,000,000 $ 1,000,000,000 $ 600,000,000 [1] $ 400,000,000 [1] $ 650,000,000 $ 400,000,000 [5] $ 250,000,000 [5] $ 225,000,000 $ 225,000,000 [3]    
[1] Proceeds were used to redeem $402 million of tax-exempt bonds at Duke Energy Ohio, the repayment of outstanding commercial paper and for general corporate purposes. See Note 9 for additional information related to the redemption of Duke Energy Ohio's tax-exempt bonds.
[2] Proceeds were used to repay $196 million of debt for International Energy and for general corporate purposes.
[3] Relates to the securitization of accounts receivable at a subsidiary of Duke Energy Florida. Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes. See Note 13 for further details.
[4] Proceeds were used to fund a portion of Duke Energy's prior investment in the existing Wind Star renewables portfolio.
[5] Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes.