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Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate |  | 3.00% | 2.80% | 2.80% |
Duke Energy Carolinas [Member] |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate |  | 2.80% | 2.80% | 2.80% |
Progress Energy [Member] |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate |  | 2.90% | 2.60% | 2.70% |
Duke Energy Progress [Member] |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate |  | 2.90% | 2.60% | 2.60% |
Duke Energy Florida [Member] |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate |  | 3.00% | 2.80% | 2.80% |
Duke Energy Ohio [Member] |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate |  | 2.80% | 2.80% | 2.60% |
Duke Energy Indiana [Member] |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate |  | 3.30% | 3.00% | 3.10% |
Piedmont Natural Gas [Member] |  |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |  |
Weighted-average depreciation rate | 2.40% | 2.50% | 2.30% |  | 2.40%

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