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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |
Debt issuances | $ 5,550,000,000 |
Repayments of long-term debt | 3,468,000,000 | $ 2,737,000,000
Duke Energy (Parent) |  |
Debt Instrument [Line Items] |  |
Debt issuances | 1,500,000,000 |
Duke Energy (Parent) | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 500,000,000 |
Duke Energy Carolinas |  |
Debt Instrument [Line Items] |  |
Debt issuances | 900,000,000 |
Repayments of long-term debt | 457,000,000 | 5,000,000
Duke Energy Progress |  |
Debt Instrument [Line Items] |  |
Debt issuances | 1,300,000,000 |
Repayments of long-term debt | 985,000,000 | 603,000,000
Duke Energy Florida |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
Repayments of long-term debt | 570,000,000 | 210,000,000
Duke Energy Ohio |  |
Debt Instrument [Line Items] |  |
Debt issuances | 400,000,000 |
Repayments of long-term debt |  | 451,000,000
Duke Energy Indiana |  |
Debt Instrument [Line Items] |  |
Debt issuances | 550,000,000 |
Repayments of long-term debt | 500,000,000 | 60,000,000
Piedmont Natural Gas |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 400,000,000 |
Repayments of long-term debt |  | $ 350,000,000
Unsecured Debt | May 2020 2.450% Due 2030 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.45% |
Debt issuances | $ 500,000,000 |
Unsecured Debt | May 2020 3.350% Due 2050 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.35% |
Debt issuances | $ 400,000,000 |
Unsecured Debt | August 2020 0.450% Due 2022 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.43% |
Debt issuances | $ 700,000,000 |
Facility term | 2 years |
Unsecured Debt | September 2020 0.900% Due 2025 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.90% |
Debt issuances | $ 650,000,000 |
Unsecured Debt | September 2020 2.450% Due 2030 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.45% |
Debt issuances | $ 350,000,000 |
Unsecured Debt | Duke Energy (Parent) | May 2020 2.450% Due 2030 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
Unsecured Debt | Duke Energy (Parent) | September 2020 0.900% Due 2025 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 650,000,000 |
Unsecured Debt | Duke Energy (Parent) | September 2020 2.450% Due 2030 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 350,000,000 |
Unsecured Debt | Duke Energy (Parent) | Term loan due March 2021 |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 1,700,000,000 |
Unsecured Debt | Duke Energy Progress | August 2020 0.450% Due 2022 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 700,000,000 |
Unsecured Debt | Duke Energy Progress | Two-year term loan facility expiring in December 2020 |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 700,000,000 |
Unsecured Debt | Piedmont Natural Gas | May 2020 3.350% Due 2050 |  |
Debt Instrument [Line Items] |  |
Debt issuances | $ 400,000,000 |
First Mortgage Bonds | January 2020 2.450% Due 2030 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.45% |
Debt issuances | $ 500,000,000 |
First Mortgage Bonds | January 2020 3.20% Due 2049 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.20% |
Debt issuances | $ 400,000,000 |
First Mortgage Bonds | March 2020 2.750% Due 2050 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.75% |
Debt issuances | $ 550,000,000 |
First Mortgage Bonds | May 2020 2.125% Due 2030 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.125% |
Debt issuances | $ 400,000,000 |
First Mortgage Bonds | June 2020 1.750% Due 2030 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.75% |
Debt issuances | $ 500,000,000 |
First Mortgage Bonds | August 2020 2.500% Due 2050 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.50% |
Debt issuances | $ 600,000,000 |
First Mortgage Bonds | Duke Energy Carolinas | January 2020 2.450% Due 2030 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
First Mortgage Bonds | Duke Energy Carolinas | January 2020 3.20% Due 2049 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 400,000,000 |
First Mortgage Bonds | Duke Energy Carolinas | First mortgage bonds due June 2020 |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 450,000,000 |
First Mortgage Bonds | Duke Energy Progress | August 2020 2.500% Due 2050 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 600,000,000 |
First Mortgage Bonds | Duke Energy Progress | First mortgage bonds due September 2020 |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | 300,000,000 |
First Mortgage Bonds | Duke Energy Florida | June 2020 1.750% Due 2030 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 500,000,000 |
First Mortgage Bonds | Duke Energy Ohio | May 2020 2.125% Due 2030 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 400,000,000 |
First Mortgage Bonds | Duke Energy Indiana | March 2020 2.750% Due 2050 |  |
Debt Instrument [Line Items] |  |
Debt issuances | 550,000,000 |
First Mortgage Bonds | Duke Energy Indiana | First mortgage bonds due July 2020 |  |
Debt Instrument [Line Items] |  |
Repayments of long-term debt | $ 500,000,000 |

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