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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 7 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 18, 2023 | May 31, 2023 | Oct. 06, 2022 | Sep. 01, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2025 | Sep. 30, 2023 | Sep. 30, 2022 | Apr. 30, 2024 | Aug. 17, 2027 | Aug. 17, 2026 | May 31, 2026 | Aug. 17, 2025 | May 31, 2025 | Aug. 17, 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 Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | 24 |  |  | 31 | 4 |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  | $ 345 | $ 350 |  | 1,051 | $ 1,101 |  |  |  |  |  |  |
2022 North Carolina Rate Case | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed rate period (in years) |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement rate, amount | $ 12,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement rate, period (in years) | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 9.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  | 28 |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  | $ 8 |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) | 47.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | $ 615 |  |  |  |  |  | $ 138 |  | $ 151 |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  | $ 494 | $ 135 |  | $ 126 |  |
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Forecast | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  |  |  | $ 326 |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 233
2022 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement rate, amount | $ 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 South Carolina Storm Securitization | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm costs |  | $ 171 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  | $ 52 |  |  |  |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 9.60% |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  | $ 36 |  |  |  |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Duke Energy Progress | Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 52.43% |  |  |  |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Retail Rate Case | PSCSC | Duke Energy Progress | Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 47.57% |  |  |  |  |  |  |  |  |  |  |  |
2022 South Carolina Rate Case, Coal Ash Basin Closure Costs | PSCSC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compliance costs period (in years) |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Deferred compliance costs |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |  |

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