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Debt and Credit Facilities (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2022 | Jan. 31, 2026 | Oct. 31, 2025 | Apr. 30, 2025 | Nov. 30, 2024 | Jan. 31, 2024 | Dec. 31, 2022 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Aug. 12, 2025 | Feb. 28, 2025 | Mar. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 3,850,000,000 |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  |  | 1,815,000,000 | $ 2,731,000,000 |  |  |
Duke Energy (Parent) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  |  | 503,000,000 | 9,000,000 |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | 2,100,000,000 |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  |  | 423,000,000 | 41,000,000 |  |  |
Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Repayments of long-term debt |  |  |  |  |  |  |  |  |  | 35,000,000 | $ 365,000,000 |  |  |
Unsecured Debt | Notes maturing October 2025 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ 95,000,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | Notes maturing January 2026 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures issued August 2025 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures maturing September 2030 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 68,000,000 |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 5.41% |  |
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures maturing September 2035 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 43,000,000 |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.01% |  |
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures maturing September 2037 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.11% |  |
Line of Credit | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility term (in years) |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |
Line of Credit | Duke Energy Carolinas | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 700,000,000 |  |  |  |  | 700,000,000 |  |  |  |
Extension period (in years) |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |
Increase in term loan facility |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |
Borrowing amount |  |  |  | $ 100,000,000 |  |  |  | $ 145,000,000 | $ 455,000,000 |  |  |  |  |
Line of Credit | Duke Energy Progress | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 250,000,000 |  |  |  |  | 250,000,000 |  |  |  |
Extension period (in years) |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |
Increase in term loan facility |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |
Borrowing amount |  |  |  |  |  |  |  | 65,000,000 | 185,000,000 |  |  |  |  |
Line of Credit | Duke Energy Florida | Duke Energy Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  | $ 800,000,000 |  |  |  |  | 800,000,000 |  |  |  |
Facility term (in years) |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |
Extension period (in years) |  |  |  |  | 4 months |  |  |  |  |  |  |  |  |
Increase in term loan facility |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Borrowing amount |  |  |  |  |  |  |  | 700,000,000 | $ 100,000,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  | $ 10,000,000,000 |  | 10,000,000,000 |  |  | $ 9,000,000,000 |
Revolving Credit Facility | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |
Revolving Credit Facility | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  |  |  | 1,125,000,000 |  |  |  |
Revolving Credit Facility | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  |  |  | $ 1,150,000,000 |  |  |  |
Revolving Credit Facility | Line of Credit | Duke Energy (Parent) | Three-Year Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Facility term (in years) | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt | Line of Credit | Duke Energy (Parent) | Term Loan Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility size |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000,000
Repayments of debt |  |  |  |  |  | $ 1,000,000,000 | $ 400,000,000 |  |  |  |  |  |  |

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