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Employee Benefit Plans (Contributions to Defined Benefit Pension Plans) (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 100 $ 100 $ 100
Duke Energy Carolinas      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 27 26 26
Progress Energy      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 23 23 22
Duke Energy Progress      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 14 14 13
Duke Energy Florida      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 10 9 9
Duke Energy Ohio      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 6 5 5
Duke Energy Indiana      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 8 8 8
Piedmont      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 3 $ 3 $ 3