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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Revolving Credit Facility - USD ($)
Sep. 30, 2025
Mar. 31, 2025
Feb. 28, 2025
Line of Credit Facility [Line Items]      
Facility size $ 10,000,000,000 $ 10,000,000,000 $ 9,000,000,000
Commercial paper (2,409,000,000)    
Outstanding letters of credit (7,000,000)    
Tax-exempt bonds (81,000,000)    
Available capacity under the Master Credit Facility 7,503,000,000    
Duke Energy (Parent)      
Line of Credit Facility [Line Items]      
Facility size 3,925,000,000    
Commercial paper (1,350,000,000)    
Outstanding letters of credit (2,000,000)    
Tax-exempt bonds 0    
Available capacity under the Master Credit Facility 2,573,000,000    
Duke Energy Carolinas      
Line of Credit Facility [Line Items]      
Facility size 1,000,000,000    
Commercial paper (370,000,000)    
Outstanding letters of credit (4,000,000)    
Tax-exempt bonds 0    
Available capacity under the Master Credit Facility 626,000,000    
Duke Energy Progress      
Line of Credit Facility [Line Items]      
Facility size 1,125,000,000    
Commercial paper (150,000,000)    
Outstanding letters of credit (1,000,000)    
Tax-exempt bonds 0    
Available capacity under the Master Credit Facility 974,000,000    
Duke Energy Florida      
Line of Credit Facility [Line Items]      
Facility size 1,150,000,000    
Commercial paper (170,000,000)    
Outstanding letters of credit 0    
Tax-exempt bonds 0    
Available capacity under the Master Credit Facility 980,000,000    
Duke Energy Ohio      
Line of Credit Facility [Line Items]      
Facility size 950,000,000    
Commercial paper (25,000,000)    
Outstanding letters of credit 0    
Tax-exempt bonds 0    
Available capacity under the Master Credit Facility 925,000,000    
Duke Energy Indiana      
Line of Credit Facility [Line Items]      
Facility size 800,000,000    
Commercial paper (150,000,000)    
Outstanding letters of credit 0    
Tax-exempt bonds (81,000,000)    
Available capacity under the Master Credit Facility 569,000,000    
Piedmont      
Line of Credit Facility [Line Items]      
Facility size 1,050,000,000    
Commercial paper (194,000,000)    
Outstanding letters of credit 0    
Tax-exempt bonds 0    
Available capacity under the Master Credit Facility 856,000,000    
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants      
Line of Credit Facility [Line Items]      
Commercial paper $ (625,000,000)