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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | $ 5,550,000,000 | $ 6,210,000,000 |
Repayments of long-term debt |  | $ 4,506,000,000 | $ 3,476,000,000 | $ 2,906,000,000
May 2020 Debt Issuance Due June 2030 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 2.45% |  |
Debt issuances |  | $ 500,000,000 |  |
May 2020 Debt Issuance Due June 2030 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 2.125% |  |
Debt issuances |  | $ 400,000,000 |  |
May 2020 Debt Issuance Due June 2050 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 3.35% |  |
Debt issuances |  | $ 400,000,000 |  |
August 2020 Debt Issuance Due February 2022 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 0.40% |  |
Debt issuances |  | $ 700,000,000 |  |
September 2020 Debt Issuance Due September 2025 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 0.90% |  |
Debt issuances |  | $ 650,000,000 |  |
September 2020 Debt Issuance Due June 2030 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 2.45% |  |
Debt issuances |  | $ 350,000,000 |  |
January 2020 Debt Issuance 2.450% Coupon Due 2030 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 2.45% |  |
Debt issuances |  | $ 500,000,000 |  |
January 2020 Debt Issuance 3.20% Due August 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 3.20% |  |
Debt issuances |  | $ 400,000,000 |  |
March 2020 Debt Issuance 2.750% Due April 2050 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 2.75% |  |
Debt issuances |  | $ 550,000,000 |  |
June 2020 Debt Issuance Due June 2030 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 1.75% |  |
Debt issuances |  | $ 500,000,000 |  |
August 2020 Debt Issuance Due August 2050 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  | 2.50% |  |
Debt issuances |  | $ 600,000,000 |  |
March 2019 Debt Issuance Due March 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 2.538% |
March 2019 Debt Issuance Due March 2022 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 300,000,000 |
March 2019 Debt Issuance 3.227% Coupon Due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.227% |
March 2019 Debt Issuance 3.227% Coupon Due 2022 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 300,000,000 |
May 2019 Debt Issuance 3.500% Coupon Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.50% |
May 2019 Debt Issuance 3.500% Coupon Due 2029 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 600,000,000 |
June 2019 Debt Issuance 3.400% Coupon Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.40% |
June 2019 Debt Issuance 3.400% Coupon Due 2029 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 600,000,000 |
June 2019 Debt Issuance 4.200% Coupon Due 2049 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 4.20% |
June 2019 Debt Issuance 4.200% Coupon Due 2049 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 600,000,000 |
July 2019 Debt Issuance 4.320% Coupon Due 2049 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 4.32% |
July 2019 Debt Issuance 4.320% Coupon Due 2049 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 40,000,000 |
September 2019 Debt Issuance 3.230% Coupon Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.23% |
September 2019 Debt Issuance 3.230% Coupon Due 2025 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 95,000,000 |
September 2019 Debt Issuance 3.560% Coupon Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.56% |
September 2019 Debt Issuance 3.560% Coupon Due 2029 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 75,000,000 |
November 2019 Debt Issuance 2.167% Coupon Due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 2.167% |
November 2019 Debt Issuance 2.167% Coupon Due 2021 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 200,000,000 |
January 2019 Debt Issuance 3.650% Coupon Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.65% |
January 2019 Debt Issuance 3.650% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 400,000,000 |
January 2019 Debt Issuance 4.300% Coupon Due 2049 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 4.30% |
January 2019 Debt Issuance 4.300% Coupon Due 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 400,000,000 |
March 2019 Debt Issuance 3.450% Coupon Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.45% |
March 2019 Debt Issuance 3.450% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 600,000,000 |
August 2019 Debt Issuance 2.450% Coupon Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 2.45% |
August 2019 Debt Issuance 2.450% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 450,000,000 |
August 2019 Debt Issuance 3.200% Coupon Due 2049 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.20% |
August 2019 Debt Issuance 3.200% Coupon Due 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 350,000,000 |
September 2019 Debt Issuance 3.250% Coupon Due 2049 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 3.25% |
September 2019 Debt Issuance 3.250% Coupon Due 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 500,000,000 |
November 2019 Debt Issuance 2.500% Coupon Due 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Rate |  |  | 2.50% |
November 2019 Debt Issuance 2.500% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | $ 700,000,000 |
Parent Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 1,500,000,000 | 1,800,000,000 |
Parent Company | May 2020 Debt Issuance Due June 2030 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 500,000,000 |  |
Parent Company | September 2020 Debt Issuance Due September 2025 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 650,000,000 |  |
Parent Company | September 2020 Debt Issuance Due June 2030 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 350,000,000 |  |
Parent Company | March 2019 Debt Issuance Due March 2022 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 300,000,000 |
Parent Company | March 2019 Debt Issuance 3.227% Coupon Due 2022 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 300,000,000 |
Parent Company | June 2019 Debt Issuance 3.400% Coupon Due 2029 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 600,000,000 |
Parent Company | June 2019 Debt Issuance 4.200% Coupon Due 2049 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 600,000,000 |
Duke Energy Carolinas |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 900,000,000 | 800,000,000 |
Repayments of long-term debt |  | 813,000,000 | 6,000,000 | 1,205,000,000
Duke Energy Carolinas | January 2020 Debt Issuance 2.450% Coupon Due 2030 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 500,000,000 |  |
Duke Energy Carolinas | January 2020 Debt Issuance 3.20% Due August 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 400,000,000 |  |
Duke Energy Carolinas | Bonds Maturing June 2020, 4.300% Coupon | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt | $ 450,000,000 |  |  |
Duke Energy Carolinas | August 2019 Debt Issuance 2.450% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 450,000,000 |
Duke Energy Carolinas | August 2019 Debt Issuance 3.200% Coupon Due 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 350,000,000 |
Duke Energy Progress |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 1,300,000,000 | 600,000,000 |
Repayments of long-term debt |  | 1,085,000,000 | 605,000,000 | 3,000,000
Duke Energy Progress | Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  | 700,000,000 |  |
Duke Energy Progress | August 2020 Debt Issuance Due February 2022 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 700,000,000 |  |
Duke Energy Progress | August 2020 Debt Issuance Due August 2050 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 600,000,000 |  |
Duke Energy Progress | Bonds Due September 2020 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  | 300,000,000 |  |
Duke Energy Progress | March 2019 Debt Issuance 3.450% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 600,000,000 |
Duke Energy Florida |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 500,000,000 | 900,000,000 |
Repayments of long-term debt |  | 572,000,000 | 262,000,000 | 769,000,000
Duke Energy Florida | June 2020 Debt Issuance Due June 2030 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 500,000,000 |  |
Duke Energy Florida | November 2019 Debt Issuance 2.167% Coupon Due 2021 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 200,000,000 |
Duke Energy Florida | November 2019 Debt Issuance 2.500% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 700,000,000 |
Duke Energy Ohio |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 400,000,000 | 1,010,000,000 |
Repayments of long-term debt |  |  | 551,000,000 | 3,000,000
Duke Energy Ohio | May 2020 Debt Issuance Due June 2030 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 400,000,000 |  |
Duke Energy Ohio | July 2019 Debt Issuance 4.320% Coupon Due 2049 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 40,000,000 |
Duke Energy Ohio | September 2019 Debt Issuance 3.230% Coupon Due 2025 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 95,000,000 |
Duke Energy Ohio | September 2019 Debt Issuance 3.560% Coupon Due 2029 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 75,000,000 |
Duke Energy Ohio | January 2019 Debt Issuance 3.650% Coupon Due 2029 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 400,000,000 |
Duke Energy Ohio | January 2019 Debt Issuance 4.300% Coupon Due 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 400,000,000 |
Duke Energy Ohio | April 2019 First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  |  | 450,000,000 |
Duke Energy Ohio | Debentures Due October 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  |  | 100,000,000 |
Duke Energy Indiana |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 550,000,000 | 500,000,000 |
Repayments of long-term debt |  | 513,000,000 | 213,000,000 | $ 3,000,000
Duke Energy Indiana | March 2020 Debt Issuance 2.750% Due April 2050 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 550,000,000 |  |
Duke Energy Indiana | Bonds Due July 2020 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  | 500,000,000 |  |
Duke Energy Indiana | September 2019 Debt Issuance 3.250% Coupon Due 2049 | First Mortgage Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 500,000,000 |
Duke Energy Indiana | Pollution Control Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  |  | 150,000,000 |
Piedmont |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 400,000,000 | 600,000,000 |
Repayments of long-term debt |  |  | 350,000,000 |
Piedmont | May 2020 Debt Issuance Due June 2050 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  | 400,000,000 |  |
Piedmont | May 2019 Debt Issuance 3.500% Coupon Due 2029 | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt issuances |  |  | 600,000,000 |
Piedmont | Senior Unsecured Term Loan Facility Due September 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  |  | $ 350,000,000 |
Duke Energy (Parent) | Term Loan Due March 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  | 1,700,000,000 |  |
Revolving Credit Facility | Duke Energy (Parent) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt |  | $ 500,000,000 |  |

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