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Regulatory Matters (Duke Energy Carolinas Narrative) (Details) - USD ($) $ in Millions |  |  |  | 11 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 04, 2024 | Dec. 15, 2023 | Aug. 22, 2023 | Dec. 31, 2026 | Dec. 14, 2027 | Dec. 14, 2026 | Jan. 18, 2026 | Dec. 14, 2025 | Jan. 18, 2025 | Dec. 14, 2024 | Jan. 18, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 03, 2028 | Jan. 03, 2026
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | $ 85 | $ 434 | $ 353 |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  | 5,625 | 5,734 | 5,703 |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | 44 | 26 | 227 |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  | 1,774 | $ 1,892 | $ 1,833 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  | 29 |  |  |  |
Operation, maintenance and other |  |  |  |  |  |  |  |  |  |  |  | $ 8 |  |  |  |
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 | Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved return on equity (as a percent) |  | 47.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  | $ 823 |  |  | $ 150 |  | $ 172 |  |  |  |  |  |  |
Requested return on equity (as a percent) |  |  |  | 15.70% |  |  |  |  |  |  |  |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  | $ 768 | $ 158 |  | $ 174 |  |  |  |  |  |  |  |
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) |  |  |  |  |  |  |  |  |  |  | $ 501 |  |  |  |  |
Approved rate increase (decrease) amount by state commission |  |  |  |  |  |  |  |  |  | $ 436 |  |  |  |  |  |
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  | $ 4,600 |  |  |  |  |  |  |  |  |  |  |  |  |
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease) | $ 323 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), percent | 15.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.10% |
Requested rate increase (decrease), amended, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 84 |
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), net of tax (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.40%
Requested rate increase (decrease), amended, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 239

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