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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) $ in Millions |  |  |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended | 24 Months Ended
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Mar. 14, 2024 USD ($) numberOfCombustionTurbines MW | Jan. 04, 2024 USD ($) | Dec. 15, 2023 | Aug. 22, 2023 USD ($) | Jan. 19, 2023 | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2026 USD ($) | Dec. 14, 2027 USD ($) | Dec. 14, 2026 USD ($) | Aug. 31, 2026 USD ($) | Dec. 14, 2025 USD ($) | Aug. 31, 2025 USD ($) | Dec. 14, 2024 USD ($) | Aug. 31, 2024 USD ($) | Jan. 03, 2028 USD ($) | Jan. 03, 2026 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  | $ 1 | $ 8 |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  | 1,379 | 1,310 |  |  |  |  |  |  |  |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  | 1 | 2 |  |  |  |  |  |  |  |  |  |
Operation, maintenance and other |  |  |  |  |  | $ 451 | $ 440 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity percentage (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 percentage (as a percent) |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  |  | $ 823 |  |  | $ 150 |  | $ 172 |  | $ 501 |  |
Requested rate increase (decrease) (as a percent) |  |  |  |  |  |  |  | 15.70% |  |  |  |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  |  |  | $ 768 | $ 158 |  | $ 174 |  | $ 436 |  |  |
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement rate, amount |  |  |  | $ 4,600 |  |  |  |  |  |  |  |  |  |  |  |  |
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 323 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) |  | 15.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested return on equity (as a percent) |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ratio (as a percent) |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase, percentage, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.10% | 11.40%
Requested rate increase (decrease), amended amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 84 | $ 239
Marshall Combustion Turbines CPCN Proceedings | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 104 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) (as a percent) | 2.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New combustion turbines (in megawatts) | MW | 850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hydrogen-capable CTs | numberOfCombustionTurbines | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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