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Summary of Significant Accounting Policies (Inventory) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Public Utilities, Inventory [Line Items]    
Materials and supplies $ 3,542 $ 3,386
Coal 715 801
Natural gas, oil and other 312 309
Total inventory 4,569 4,496
Duke Energy Carolinas    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,157 1,150
Coal 328 341
Natural gas, oil and other 45 45
Total inventory 1,530 1,536
Progress Energy    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,789 1,649
Coal 235 241
Natural gas, oil and other 186 196
Total inventory 2,210 2,086
Duke Energy Progress    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,109 1,074
Coal 155 164
Natural gas, oil and other 99 103
Total inventory 1,363 1,341
Duke Energy Florida    
Public Utilities, Inventory [Line Items]    
Materials and supplies 680 576
Coal 80 77
Natural gas, oil and other 87 92
Total inventory 847 745
Duke Energy Ohio    
Public Utilities, Inventory [Line Items]    
Materials and supplies 155 149
Coal 21 23
Natural gas, oil and other 11 11
Total inventory 187 183
Duke Energy Indiana    
Public Utilities, Inventory [Line Items]    
Materials and supplies 398 389
Coal 131 196
Natural gas, oil and other 2 1
Total inventory 531 586
Piedmont    
Public Utilities, Inventory [Line Items]    
Materials and supplies 10 11
Coal 0  
Natural gas, oil and other 67 55
Total inventory $ 77 $ 66