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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) |  |  |  | 3 Months Ended | 7 Months Ended | 11 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2024 USD ($) MW | Aug. 18, 2023 USD ($) | Apr. 26, 2023 | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2025 USD ($) | Apr. 30, 2024 USD ($) | Aug. 17, 2027 USD ($) | Aug. 17, 2026 USD ($) | May 31, 2026 USD ($) | Aug. 17, 2025 USD ($) | May 31, 2025 USD ($) | Aug. 17, 2024 USD ($) | Jan. 01, 2026 MW | Apr. 25, 2024 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | $ 1,000,000 | $ 8,000,000 |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  | 1,379,000,000 | 1,310,000,000 |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  | 3,475,000,000 |  |  |  |  |  |  |  |  |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  | 0 | 4,000,000 |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  | 375,000,000 | $ 350,000,000 |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Duke Energy Progress | Subsequent event | Storm Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 177,000,000
Duke Energy Progress | Subsequent event | 5.404% Storm Recovery Bonds | Storm Recovery Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuances |  |  |  |  |  |  | $ 177,000,000 |  |  |  |  |  |  |  |
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 |  | $ 12,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement rate, period (in years) |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  | 9.80% |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 615,000,000 | $ 326,000,000 |  |  | $ 138,000,000 |  | $ 151,000,000 |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  | $ 494,000,000 | $ 135,000,000 |  | $ 126,000,000 |  | $ 233,000,000 |  |
2022 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement rate, amount |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Person County Cycle CPCN Proceeding | NCUC | Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 98,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW | 1,360 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) | 2.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Person County Cycle CPCN Proceeding | NCUC | NCEMC | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  | 225 |
Person County Cycle CPCN Proceeding | NCEMC | Duke Energy Progress | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,135 |

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