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Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) MW | Dec. 31, 2017 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Public Utilities, Property, Plant and Equipment, Net | $ 88,495 | $ 86,391
Duke Energy Carolinas [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public Utilities, Property, Plant and Equipment, Net | 28,181 | 27,876
Progress Energy [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public Utilities, Property, Plant and Equipment, Net | 32,894 | 31,887
Duke Energy Florida [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public Utilities, Property, Plant and Equipment, Net | 13,274 | 12,783
Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public Utilities, Property, Plant and Equipment, Net | $ 10,446 | $ 10,286
Generation Facilities To Be Retired [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 1,738 |
Public Utilities, Property, Plant and Equipment, Net | $ 387 |
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 | $ 160 |
Crystal River Units 1 and 2 [Member] | Generation Facilities To Be Retired [Member] | Progress Energy [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 873 |
Public Utilities, Property, Plant and Equipment, Net | $ 102 |
Crystal River Units 1 and 2 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Florida [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 873 |
Public Utilities, Property, Plant and Equipment, Net | $ 102 |
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 | $ 125 |

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