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Debt and Credit Facilities (Schedule of Line of Credit Facilities) (Details) - Master Credit Facility - USD ($)
Sep. 30, 2024
Mar. 31, 2024
Line of Credit Facility [Line Items]    
Facility size $ 9,000,000,000 $ 9,000,000,000
Commercial paper (3,526,000,000)  
Outstanding letters of credit (24,000,000)  
Tax-exempt bonds (81,000,000)  
Available capacity under the Master Credit Facility 5,369,000,000  
Duke Energy Carolinas    
Line of Credit Facility [Line Items]    
Facility size 1,400,000,000  
Commercial paper (300,000,000)  
Outstanding letters of credit (4,000,000)  
Tax-exempt bonds 0  
Available capacity under the Master Credit Facility 1,096,000,000  
Duke Energy Progress    
Line of Credit Facility [Line Items]    
Facility size 1,500,000,000  
Commercial paper (698,000,000)  
Outstanding letters of credit (1,000,000)  
Tax-exempt bonds 0  
Available capacity under the Master Credit Facility 801,000,000  
Duke Energy Florida    
Line of Credit Facility [Line Items]    
Facility size 875,000,000  
Commercial paper (175,000,000)  
Outstanding letters of credit (7,000,000)  
Tax-exempt bonds 0  
Available capacity under the Master Credit Facility 693,000,000  
Duke Energy Ohio    
Line of Credit Facility [Line Items]    
Facility size 1,050,000,000  
Commercial paper (206,000,000)  
Outstanding letters of credit 0  
Tax-exempt bonds 0  
Available capacity under the Master Credit Facility 844,000,000  
Duke Energy Indiana    
Line of Credit Facility [Line Items]    
Facility size 950,000,000  
Commercial paper (160,000,000)  
Outstanding letters of credit 0  
Tax-exempt bonds (81,000,000)  
Available capacity under the Master Credit Facility 709,000,000  
Piedmont    
Line of Credit Facility [Line Items]    
Facility size 950,000,000  
Commercial paper (461,000,000)  
Outstanding letters of credit 0  
Tax-exempt bonds 0  
Available capacity under the Master Credit Facility 489,000,000  
Duke Energy (Parent) | Proceeds loaned to subsidiary registrants    
Line of Credit Facility [Line Items]    
Commercial paper (625,000,000)  
Duke Energy (Parent) | Duke Energy (Parent)    
Line of Credit Facility [Line Items]    
Facility size 2,275,000,000  
Commercial paper (1,526,000,000)  
Outstanding letters of credit (12,000,000)  
Tax-exempt bonds 0  
Available capacity under the Master Credit Facility $ 737,000,000