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Variable Interest Entities (Narrative) (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Apr. 30, 2025 | Mar. 31, 2025 | Jan. 31, 2025 | Apr. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Dec. 31, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 650,000,000 | $ 150,000,000 |  |  |  |  |  |  |  |  |
Debt issuances | 6,794,000,000 |  |  |  |  |  |  | $ 6,794,000,000 |  |  |
DEPR accounts receivable securitization facility due April 2025 | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 400,000,000 |  |  |  |  |  |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances | 1,682,000,000 |  |  |  |  |  |  | 1,682,000,000 |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances | 2,561,000,000 |  |  |  |  |  |  | 2,561,000,000 |  |  |
Duke Energy (Parent) |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances | 1,750,000,000 |  |  |  |  |  |  | 1,750,000,000 |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances | 300,000,000 |  |  |  |  |  |  | 300,000,000 |  |  |
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances | 501,000,000 |  |  |  |  |  |  | 501,000,000 |  |  |
VIE primary beneficiary |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, financial or other support, amount |  |  |  |  |  |  |  | 0 | $ 0 |  |
VIE primary beneficiary | Duke Energy Florida | DEPR accounts receivable securitization facility due April 2025 | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 325,000,000 |  |  |  |  |
VIE primary beneficiary | Duke Energy Carolinas | DEPR accounts receivable securitization facility due April 2025 | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
VIE primary beneficiary | Duke Energy Progress | DEPR accounts receivable securitization facility due April 2025 | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
VIE primary beneficiary | DEFR | Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  | $ 459,000,000 |  |  |  |
VIE primary beneficiary | DEFR | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  | $ 1,081,000,000 |  |
VIE primary beneficiary | DEPR | Duke Energy (Parent) |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  | $ 943,000,000 |
VIE primary beneficiary | Cinergy Receivables |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 350,000,000 |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  |  | $ 682,000,000
VIE primary beneficiary | Cinergy Receivables | Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  |  | 316,000,000
VIE primary beneficiary | Cinergy Receivables | Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  |  | $ 366,000,000
VIE primary beneficiary | DEPSCSF | Duke Energy Progress | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  |  | $ 177,000,000 |  |  |  |  |
VIE primary beneficiary | DECNCSFII | Duke Energy Carolinas | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances | 582,000,000 |  |  |  |  |  |  | 582,000,000 |  |  |
VIE primary beneficiary | DEPNCSFII | Duke Energy Progress | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuances | $ 461,000,000 |  |  |  |  |  |  | $ 461,000,000 |  |  |

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