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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Public Utilities, Inventory [Line Items]    
Materials and supplies $ 3,387 $ 3,086
Coal 801 842
Natural gas, oil and other 321 364
Total inventory 4,509 4,292
Duke Energy Carolinas    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,150 1,075
Coal 341 364
Natural gas, oil and other 45 45
Total inventory 1,536 1,484
Progress Energy    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,649 1,465
Coal 241 231
Natural gas, oil and other 196 205
Total inventory 2,086 1,901
Duke Energy Progress    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,074 963
Coal 164 154
Natural gas, oil and other 103 110
Total inventory 1,341 1,227
Duke Energy Florida    
Public Utilities, Inventory [Line Items]    
Materials and supplies 576 502
Coal 77 77
Natural gas, oil and other 92 95
Total inventory 745 674
Duke Energy Ohio    
Public Utilities, Inventory [Line Items]    
Materials and supplies 149 139
Coal 23 28
Natural gas, oil and other 11 12
Total inventory 183 179
Duke Energy Indiana    
Public Utilities, Inventory [Line Items]    
Materials and supplies 389 361
Coal 196 219
Natural gas, oil and other 1 2
Total inventory 586 582
Piedmont    
Public Utilities, Inventory [Line Items]    
Materials and supplies 11 12
Natural gas, oil and other 67 100
Total inventory $ 78 $ 112