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Regulatory Matters (Schedule of Net Carrying Value Of Facilities) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Remaining net book value | $ 102,127 | $ 91,694
Piedmont |  |
Public Utilities, General Disclosures [Line Items] |  |
Remaining net book value | 6,765 | 5,911
Duke Energy Carolinas |  |
Public Utilities, General Disclosures [Line Items] |  |
Remaining net book value | 32,397 | 29,245
Duke Energy Indiana |  |
Public Utilities, General Disclosures [Line Items] |  |
Remaining net book value | $ 11,072 | $ 10,529
Generating facilities planned for retirement |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 5,002 |
Remaining net book value | $ 2,937 |
Generating facilities planned for retirement | Duke Energy Carolinas | Allen Steam Station Units 1-3 |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 585 |
Remaining net book value | $ 152 |
Generating facilities planned for retirement | Duke Energy Indiana | Gallagher Units 2 and 4 |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 280 |
Remaining net book value | $ 114 |
Generating facilities planned for retirement | Duke Energy Indiana | Gibson Units 1 - 5 |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 3,132 |
Remaining net book value | $ 1,697 |
Generating facilities planned for retirement | Duke Energy Indiana | Cayuga Units 1 - 2 |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 1,005 |
Remaining net book value | $ 974 |

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