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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 22, 2023 | Jan. 19, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2026 | Sep. 30, 2023 | Sep. 30, 2022 | Aug. 31, 2026 | Aug. 31, 2025 | Aug. 31, 2024
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  | $ 88 | $ (4) |  | $ 96 | $ 202 |  |  |
Operation, maintenance and other |  |  | 1,428 | 1,308 |  | 4,113 | 4,223 |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  | 64 | 6 |  | 70 | (3) |  |  |
Operation, maintenance and other |  |  | $ 424 | $ 436 |  | 1,285 | $ 1,410 |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed rate period (in years) |  | 3 years |  |  |  |  |  |  |  |
Settlement rate, amount | $ 19,500 |  |  |  |  |  |  |  |  |
Settlement rate, period (in years) | 3 years |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  | 59 |  |  |  |
Operation, maintenance and other |  |  |  |  |  | $ 8 |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 823 |  |  | $ 150 | $ 172 |
Requested rate increase (decrease) (as a percent) |  |  |  |  | 15.70% |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast | Subsequent event |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 501
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement rate, amount | $ 4,600 |  |  |  |  |  |  |  |  |

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