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Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 2.90% 3.00% 3.10%
Duke Energy Carolinas      
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 2.70% 2.80% 2.80%
Progress Energy      
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 3.10% 3.20% 3.10%
Duke Energy Progress      
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 3.00% 3.10% 3.10%
Duke Energy Florida      
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 3.30% 3.30% 3.10%
Duke Energy Ohio      
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 2.90% 2.90% 2.60%
Duke Energy Indiana      
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 3.60% 3.50% 3.30%
Piedmont      
Public Utility, Property, Plant and Equipment [Line Items]      
Weighted-average depreciation rate 2.10% 2.30% 2.40%