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v3.20.4

Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 3.00% | 3.10% | 3.00%
Duke Energy Carolinas |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 2.80% | 2.80% | 2.80%
Progress Energy |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 3.20% | 3.10% | 2.90%
Duke Energy Progress |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 3.10% | 3.10% | 2.90%
Duke Energy Florida |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 3.30% | 3.10% | 3.00%
Duke Energy Ohio |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 2.90% | 2.60% | 2.80%
Duke Energy Indiana |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 3.50% | 3.30% | 3.30%
Piedmont |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |
Weighted-average depreciation rate | 2.30% | 2.40% | 2.50%

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