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Regulatory Matters (Schedule of Net Carrying Value Of Facilities) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2034 asset | Dec. 31, 2020 USD ($) MW | Dec. 31, 2019 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |
Remaining net book value |  | $ 106,782 | $ 102,127
Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 9,391 |
Remaining net book value |  | $ 6,402 |
Duke Energy Carolinas |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Remaining net book value |  | $ 33,187 | 32,397
Duke Energy Carolinas | Allen Steam Station Units 1-3 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 604 |
Remaining net book value |  | $ 113 |
Duke Energy Carolinas | Allen Steam Station Units 4-5 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 526 |
Remaining net book value |  | $ 338 |
Duke Energy Carolinas | Cliffside Unit 5 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 546 |
Remaining net book value |  | $ 350 |
Duke Energy Carolinas | Allen Steam Station 3 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 270 |
Remaining net book value |  | $ 26 |
Duke Energy Progress |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Remaining net book value |  | $ 22,987 | 22,934
Duke Energy Progress | Mayo Unit 1 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 746 |
Remaining net book value |  | $ 676 |
Duke Energy Progress | Roxboro Units 3-4 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 1,409 |
Remaining net book value |  | $ 484 |
Duke Energy Florida |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Remaining net book value |  | $ 16,563 | 15,221
Duke Energy Florida | Crystal River Units 4 and 5 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 1,430 |
Remaining net book value |  | $ 1,696 |
Duke Energy Florida | Crystal River Units 4 and 5 | Generating facilities planned for retirement | Forecast |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Facilities retiring ahead of schedule | asset | 2 |  |
Facilities retiring ahead of schedule, years ahead | 8 years |  |
Duke Energy Indiana |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Remaining net book value |  | $ 11,721 | $ 11,072
Duke Energy Indiana | Gallagher Units 2 and 4 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 280 |
Remaining net book value |  | $ 102 |
Duke Energy Indiana | Gibson Units 1 - 5 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 2,845 |
Remaining net book value |  | $ 1,866 |
Duke Energy Indiana | Cayuga Units 1 - 2 | Generating facilities planned for retirement |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity (in MW) | MW |  | 1,005 |
Remaining net book value |  | $ 777 |

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