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Variable Interest Entities (Narrative) (Details) - VIE primary beneficiary - USD ($) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Jan. 31, 2025 | Apr. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Variable interest entity, financial or other support, amount |  |  |  |  | $ 0 | $ 0 |  |
Duke Energy Florida | DEPR accounts receivable securitization facility due April 2025 | Secured Debt |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 325,000,000 |  |  |  |  |
Duke Energy Carolinas | DEPR accounts receivable securitization facility due April 2025 | Secured Debt |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 500,000,000 |  |  |  |  |  |
Duke Energy Progress | DEPR accounts receivable securitization facility due April 2025 | Secured Debt |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | $ 400,000,000 |  |  |  |  |  |  |
DEFR | Duke Energy Florida |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  | $ 459,000,000 |  |  |  |
DEFR | Duke Energy Carolinas |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  | $ 1,081,000,000 |  |
DEPR | Duke Energy (Parent) |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  | $ 943,000,000 |
Cinergy Receivables |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 350,000,000 |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  | $ 682,000,000
Cinergy Receivables | Duke Energy Indiana |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  | 316,000,000
Cinergy Receivables | Duke Energy Ohio |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  | $ 366,000,000
DEPSCSF | Duke Energy Progress |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of senior secured bonds |  |  | $ 177,000,000 |  |  |  |  |

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