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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Apr. 08, 2025 | Apr. 07, 2025 | Feb. 07, 2025 USD ($) MW | Aug. 18, 2023 USD ($) | Apr. 30, 2023 | Oct. 31, 2022 | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Aug. 17, 2027 USD ($) | Aug. 17, 2026 USD ($) | Aug. 17, 2025 USD ($) | Aug. 17, 2024 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  | $ 1,499,000,000 | $ 1,380,000,000 |  |  |  |
Debt issuances |  |  |  |  |  |  | 3,200,000,000 |  |  |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  | 398,000,000 | $ 375,000,000 |  |  |  |
Debt issuances |  |  |  |  |  |  | $ 2,100,000,000 |  |  |  |  |
Nuclear Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) |  |  |  |  |  |  | 20 years |  |  |  |  |
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 |  | 3 years |  |  |  |  |  |
Approved return on equity percentage (as a percent) |  |  |  | 9.80% |  |  |  |  |  |  |  |
Public utilities, approved equity capital structure, percentage (as a percent) |  |  |  | 53.00% |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  |  |  |  | $ 233,000,000
2022 North Carolina Rate Case | NCUC | Duke Energy Progress | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 494,000,000 | $ 135,000,000 | $ 126,000,000 |
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 |  |  | $ 113,000,000 |  |  |  |  |  |  |  |  |
Generation capacity (MW) | MW |  |  | 1,360 |  |  |  |  |  |  |  |  |
Generation capacity, co-owned (MW) | MW |  |  | 225 |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  |  | 2.60% |  |  |  |  |  |  |  |  |
Robinson Subsequent License Renewal | Nuclear Regulatory Commission | Duke Energy Progress | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating license extension (in years) | 20 years |  |  |  |  |  |  |  |  |  |  |
Operating license (in years) | 80 years | 60 years |  |  |  |  |  |  |  |  |  |

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