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Debt and Credit Facilities (Summary of Current Maturities of Long-term Debt) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 4,669 | $ 3,141
Other debt obligations |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | 609 |
Progress Energy |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 1,726 | 1,577
Progress Energy | Unsecured Debt | Debt maturing January 2021, 4.400% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.40% |
Current maturities of long-term debt | $ 500 |
Duke Energy (Parent) | Unsecured Debt | Debt maturing May 2021, floating interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.765% |
Current maturities of long-term debt | $ 500 |
Duke Energy (Parent) | Unsecured Debt | Debt maturing September 2021, 3.550% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.55% |
Current maturities of long-term debt | $ 500 |
Duke Energy (Parent) | Unsecured Debt | Debt maturing September 2021, 1.800% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.80% |
Current maturities of long-term debt | $ 750 |
Piedmont Natural Gas |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 160 |
Piedmont Natural Gas | Unsecured Debt | Debt maturing June 2021, 4.240% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.24% |
Current maturities of long-term debt | $ 160 |
Duke Energy Florida |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 623 | 571
Duke Energy Florida | Secured Debt | Debt maturing April 2021, floating interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.035% |
Current maturities of long-term debt | $ 250 |
Duke Energy Florida | First Mortgage Bonds | Bonds maturing August 2021, 3.100% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.10% |
Current maturities of long-term debt | $ 300 |
Duke Energy Carolinas |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 751 | 458
Duke Energy Carolinas | First Mortgage Bonds | Bonds maturing June 2021, 3.900% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.90% |
Current maturities of long-term debt | $ 500 |
Duke Energy Progress |  |
Debt Instrument [Line Items] |  |
Current maturities of long-term debt | $ 603 | $ 1,006
Duke Energy Progress | First Mortgage Bonds | Debt maturing September 2021, 3.000% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.00% |
Current maturities of long-term debt | $ 500 |
Duke Energy Progress | First Mortgage Bonds | Debt maturing September 2021, 8.625% interest rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 8.625% |
Current maturities of long-term debt | $ 100 |

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