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Employee Benefit Plans (Employee Savings Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 272 $ 257 $ 238
Duke Energy Carolinas      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 90 81 75
Progress Energy      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 77 72 62
Duke Energy Progress      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 47 43 40
Duke Energy Florida      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 30 29 22
Duke Energy Ohio      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 7 6 6
Duke Energy Indiana      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 17 13 13
Piedmont      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 15 $ 14 $ 13