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Regulatory Matters (Schedule of Net Carrying Value Of Facilities) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) MW | Dec. 31, 2017 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Net property, plant and equipment | $ 91,694 | $ 86,391
Duke Energy Carolinas [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Net property, plant and equipment | 29,245 | 27,876
Progress Energy [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Net property, plant and equipment | 34,224 | 31,887
Duke Energy Florida [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Net property, plant and equipment | 13,824 | 12,783
Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Net property, plant and equipment | 10,529 | 10,286
Duke Energy Progress [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Net property, plant and equipment | 20,398 | 19,101
Duke Energy Ohio [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Net property, plant and equipment | $ 6,643 | $ 6,041
Generation Facilities To Be Retired [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 865 |
Net property, plant and equipment | $ 283 |
Generation Facilities To Be Retired [Member] | Duke Energy Carolinas [Member] | Allen Steam Station Units 1-3 [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 585 |
Net property, plant and equipment | $ 162 |
Generation Facilities To Be Retired [Member] | Duke Energy Indiana [Member] | Gallagher Units 2 and 4 [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 280 |
Net property, plant and equipment | $ 121 |
Federal Energy Regulatory Commission [Member] | FERC 494 Refund Of Regional Transmission Enhancement Projects [Member] | Duke Energy Ohio [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Customer Refundable Fees, Refund Payments | $ 47 |

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