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Severance (Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Severance expense $ (8) $ (28) $ 102
Operation, maintenance and other      
Restructuring Cost and Reserve [Line Items]      
Severance expense     97
Duke Energy Carolinas      
Restructuring Cost and Reserve [Line Items]      
Severance expense (2) (11) 53
Progress Energy      
Restructuring Cost and Reserve [Line Items]      
Severance expense (5) (9) 33
Duke Energy Progress      
Restructuring Cost and Reserve [Line Items]      
Severance expense (2) (5) 21
Duke Energy Florida      
Restructuring Cost and Reserve [Line Items]      
Severance expense $ (3) (4) 12
Duke Energy Ohio      
Restructuring Cost and Reserve [Line Items]      
Severance expense   (2) 3
Duke Energy Indiana      
Restructuring Cost and Reserve [Line Items]      
Severance expense   (4) 6
Piedmont      
Restructuring Cost and Reserve [Line Items]      
Severance expense   $ (2) $ 4