v3.26.1
Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Public Utilities, Inventory [Line Items]    
Total inventory $ 4,572 $ 4,569
Duke Energy (Parent)    
Public Utilities, Inventory [Line Items]    
Materials and supplies 3,601 3,542
Coal 699 715
Natural gas, oil and other fuel 272 312
Total inventory 4,572 4,569
Duke Energy Carolinas    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,185 1,157
Coal 323 328
Natural gas, oil and other fuel 36 45
Total inventory 1,544 1,530
Progress Energy    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,803 1,789
Coal 211 235
Natural gas, oil and other fuel 186 186
Total inventory 2,200 2,210
Duke Energy Progress    
Public Utilities, Inventory [Line Items]    
Materials and supplies 1,104 1,109
Coal 143 155
Natural gas, oil and other fuel 103 99
Total inventory 1,350 1,363
Duke Energy Florida    
Public Utilities, Inventory [Line Items]    
Materials and supplies 700 680
Coal 68 80
Natural gas, oil and other fuel 82 87
Total inventory 850 847
Duke Energy Ohio    
Public Utilities, Inventory [Line Items]    
Materials and supplies 171 155
Coal 15 21
Natural gas, oil and other fuel 12 11
Total inventory 198 187
Duke Energy Indiana    
Public Utilities, Inventory [Line Items]    
Materials and supplies 398 398
Coal 149 131
Natural gas, oil and other fuel 3 2
Total inventory 550 531
Piedmont    
Public Utilities, Inventory [Line Items]    
Materials and supplies 10 10
Coal 0 0
Natural gas, oil and other fuel 35 67
Total inventory $ 45 $ 77