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Regulatory Matters (Duke Energy Carolinas Narrative) (Details) |  |  |  |  |  |  |  |  |  |  | 12 Months Ended | 24 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2026 USD ($) | Nov. 21, 2025 USD ($) turbine Rate MW | Nov. 20, 2025 | Nov. 11, 2025 USD ($) | Oct. 30, 2025 USD ($) MW | Jul. 03, 2024 USD ($) | May 17, 2024 USD ($) | Jan. 04, 2024 | Dec. 15, 2023 | Aug. 22, 2023 USD ($) | Dec. 14, 2027 USD ($) | Nov. 19, 2027 USD ($) | Dec. 14, 2026 USD ($) | Nov. 19, 2026 USD ($) | Dec. 31, 2025 USD ($) | Dec. 14, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 14, 2024 USD ($) | Dec. 31, 2023 USD ($) | Nov. 19, 2027 USD ($) | Dec. 31, 2025 USD ($) | Dec. 01, 2025 turbine | Nov. 30, 2025 USD ($) | Mar. 21, 2025 USD ($) | Mar. 31, 2024 turbine MW
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4,000,000) |  | $ 38,000,000 |  | $ 85,000,000 |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,698,000,000 |  | 5,389,000,000 |  | 5,625,000,000 |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,002,000,000 |  | 12,263,000,000 |  | 12,622,000,000 |  |  |  |  |  |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,379,000,000 |  | 14,220,000,000 |  |  |  | $ 14,379,000,000 |  |  |  |
Total noncurrent regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,682,000,000 |  | 14,521,000,000 |  |  |  | 15,682,000,000 |  |  |  |
Face amount of debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,005,000,000 |  | 7,740,000,000 |  |  |  | 7,005,000,000 |  |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,000,000) |  | 31,000,000 |  | 44,000,000 |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,002,000,000 |  | 1,740,000,000 |  | 1,774,000,000 |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,477,000,000 |  | 3,966,000,000 |  | 3,733,000,000 |  |  |  |  |  |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,502,000,000 |  | 4,199,000,000 |  |  |  | 4,502,000,000 |  |  |  |
Total noncurrent regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,609,000,000 |  | 6,592,000,000 |  |  |  | 7,609,000,000 |  |  |  |
Face amount of debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,243,000,000 |  | 1,000,000,000 |  |  |  | 2,243,000,000 |  |  |  |
Duke Energy Carolinas | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 408,000,000 |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 474,000,000 |  |  |  |
Duke Energy Carolinas and Duke Energy Progress | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 507,000,000 |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 762,000,000 |  |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  | 6,000,000 |  | 29,000,000 |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,455,000,000 |  | 1,388,000,000 |  | 1,379,000,000 |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,428,000,000 |  | 2,803,000,000 |  | $ 2,387,000,000 |  |  |  |  |  |
Other Noncurrent Assets: Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,543,000,000 |  | 4,555,000,000 |  |  |  | 4,543,000,000 |  |  |  |
Total noncurrent regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,807,000,000 |  | 4,570,000,000 |  |  |  | 4,807,000,000 |  |  |  |
Face amount of debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,561,000,000 |  | $ 677,000,000 |  |  |  | 2,561,000,000 |  |  |  |
Duke Energy Progress | Hurricanes Helene, Debby and Milton |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,000,000 |  |  |  |  |  |  |  |  |  |
Estimated storm restoration costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 288,000,000 |  |  |  |
NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Combined Cycle Plants, in Megawatts | MW |  | 850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 850
Number of solar plants petition for approval | turbine |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  | 2
Retail revenue requirement |  | $ 154,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in retail rate (percent) | Rate |  | 2.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSCSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Combined Cycle Plants, in Megawatts | MW |  |  |  |  | 1,365 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost of generation facilities to be built |  |  |  |  | $ 3,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Combined Cycle Plants, in Megawatts | MW |  |  |  |  | 1,170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSCSC | Duke Energy Carolinas | Hurricane Helene |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |
Face amount of debt instrument issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 561,000,000 |  |
PSCSC | NCEMC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Combined Cycle Plants, in Megawatts | MW |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSCSC | CEPC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Combined Cycle Plants, in Megawatts | MW |  |  |  |  | 95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MYRP period (in years) |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  |  |  |  |  | $ 19,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 174,000,000 |  | $ 436,000,000 |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  |  |  | 10.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  |  |  |  |  |  | $ 768,000,000 |  | $ 158,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  |  |  |  |  | $ 4,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2025 North Carolina Rate Case | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) |  |  | 10.95% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested equity ratio (percent) |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2025 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  | $ 727,000,000 |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
Requested rate increase (decrease), percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  | $ 7,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,000,000 |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  | $ 150,000,000 | $ 240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  |  |  |  | 9.94% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer giveback |  |  |  |  |  |  | $ 84,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure (as a percent) |  |  |  |  |  |  | 51.21% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |
Proposed rate period (in years) |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Carolinas | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  | 200,000,000 |  |  |  |
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Carolinas | North Carolina Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total noncurrent regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 136,000,000 |  |  |  |  |  | 136,000,000 |  |  |  |
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Progress | Natural Disasters and Other Casualty Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Storm reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  | 100,000,000 |  |  |  |
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Progress | North Carolina Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total noncurrent regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,000,000 |  |  |  |  |  | 71,000,000 |  |  |  |
Hurricanes Helene, Debby and Milton | PSCSC | Duke Energy Carolinas | Hurricane Helene |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total noncurrent regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  | $ 35,000,000 |  |  |  |
2025 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  |  |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure (as a percent) |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2025 South Carolina Rate Case | PSCSC | Duke Energy Progress | Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) | 9.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved capital structure (as a percent) | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Impairment Of Assets And Other Charges + References No definition available. + Details
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