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Debt and Credit Facilities (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Oct. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Nov. 30, 2024 | Jan. 31, 2024 | Sep. 30, 2025 | Dec. 31, 2024 | Mar. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 650 | $ 150 |  |  |  |  |
Amount of variable denomination floating-rate demand notes available for sale under S-3 |  | 4,000 |  |  |  | $ 4,000 |  |
Amount of variable denomination floating-rate demand notes allowable outstanding under S-3 |  | 2,000 |  |  |  | 2,000 |  |
Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 95 |  |  |  |  |  |  |
Line of Credit | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility term |  |  |  | 2 years |  |  |  |
Line of Credit | Duke Energy Carolinas | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility size |  |  |  | $ 700 |  |  |  |
Borrowing amount |  |  |  |  |  |  | $ 455 |
Line of Credit | Duke Energy Progress | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility size |  |  |  | 250 |  |  |  |
Borrowing amount |  |  |  |  |  |  | 185 |
Line of Credit | Duke Energy Florida | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility size |  |  |  | $ 800 |  |  |  |
Facility term |  |  |  | 364 days |  |  |  |
Borrowing amount |  |  |  |  |  |  | $ 100 |
Unsecured Debt | Line of Credit | Duke Energy (Parent) | Term Loan Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  | $ 1,400
Repayments of debt |  |  |  |  | $ 1,000 |  |  |
Term Loan Facility | Line of Credit | Duke Energy (Parent) | Delayed Draw Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility size |  | $ 2,000 |  |  |  | 2,000 |  |
Facility term |  | 364 days |  |  |  |  |  |
Borrowing amount |  | $ 1,200 |  |  |  |  |  |
Term Loan Facility | Line of Credit | Duke Energy Florida | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility size |  | 350 |  |  |  | 350 |  |
Repayments of debt |  |  |  |  |  | 450 |  |
Term Loan Facility | Line of Credit | Duke Energy Florida | Duke Energy Term Loan Facility | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 350 |  |  |  |  |  |  |
Term Loan Facility | Line of Credit | Piedmont | Term Loan Facility maturing August 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility size |  | 450 |  |  |  | $ 450 |  |
Repayments of debt |  | $ 150 |  |  |  |  |  |
Facility term |  | 364 days |  |  |  |  |  |
Borrowing amount |  | $ 450 |  |  |  |  |  |

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