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Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Public Utilities, Inventory [Line Items]    
Total inventory $ 4,338 $ 4,292
Duke Energy (Parent)    
Public Utilities, Inventory [Line Items]    
Materials and supplies 3,229 3,086
Coal 810 842
Natural gas, oil and other fuel 299 364
Total inventory 4,338 4,292
Duke Energy Carolinas    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,076 1,075
Coal 360 364
Natural gas, oil and other fuel 46 45
Total inventory 1,482 1,484
Progress Energy    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,580 1,465
Coal 232 231
Natural gas, oil and other fuel 194 205
Total inventory 2,006 1,901
Duke Energy Progress    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,052 963
Coal 161 154
Natural gas, oil and other fuel 107 110
Total inventory 1,320 1,227
Duke Energy Florida    
Public Utilities, Inventory [Line Items]    
Materials and supplies 528 502
Coal 71 77
Natural gas, oil and other fuel 87 95
Total inventory 686 674
Duke Energy Ohio    
Public Utilities, Inventory [Line Items]    
Materials and supplies 141 139
Coal 21 28
Natural gas, oil and other fuel 11 12
Total inventory 173 179
Duke Energy Indiana    
Public Utilities, Inventory [Line Items]    
Materials and supplies 381 361
Coal 197 219
Natural gas, oil and other fuel 2 2
Total inventory 580 582
Piedmont    
Public Utilities, Inventory [Line Items]    
Materials and supplies 12 12
Coal 0 0
Natural gas, oil and other fuel 46 100
Total inventory $ 58 $ 112