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Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) MW | Dec. 31, 2018 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | $ 97,198 | $ 91,694
Duke Energy Carolinas [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | 31,202 | 29,245
Duke Energy Florida [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | 14,388 | 13,824
Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | $ 10,727 | $ 10,529
Generation Facilities To Be Retired [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 5,002 |
Public utilities, property, plant and equipment, net | $ 3,217 |
Allen Steam Station Units 1-3 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Carolinas [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 585 |
Public utilities, property, plant and equipment, net | $ 156 |
Gallagher Units 2 and 4 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 280 |
Public utilities, property, plant and equipment, net | $ 118 |
Gibson Units 1-5 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 3,132 |
Public utilities, property, plant and equipment, net | $ 1,960 |
Cayuga Units 1-2 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 1,005 |
Public utilities, property, plant and equipment, net | $ 983 |

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