v3.25.2
Debt and Credit Facilities (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2022
Jan. 31, 2026
Oct. 31, 2025
Apr. 30, 2025
Nov. 30, 2024
Jan. 31, 2024
Dec. 31, 2022
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Aug. 12, 2025
Feb. 28, 2025
Mar. 31, 2022
Debt Instrument [Line Items]                            
Aggregate principal amount                   $ 3,850,000,000        
Repayments of long-term debt                   1,815,000,000 $ 2,731,000,000      
Duke Energy (Parent)                            
Debt Instrument [Line Items]                            
Aggregate principal amount                   0        
Duke Energy Carolinas                            
Debt Instrument [Line Items]                            
Aggregate principal amount                   1,100,000,000        
Repayments of long-term debt                   503,000,000 9,000,000      
Duke Energy Progress                            
Debt Instrument [Line Items]                            
Aggregate principal amount                   2,100,000,000        
Repayments of long-term debt                   423,000,000 41,000,000      
Duke Energy Florida                            
Debt Instrument [Line Items]                            
Aggregate principal amount                   0        
Repayments of long-term debt                   35,000,000 $ 365,000,000      
Unsecured Debt | Notes maturing October 2025 | Forecast                            
Debt Instrument [Line Items]                            
Repayments of long-term debt     $ 95,000,000                      
Unsecured Debt | Notes maturing January 2026 | Forecast                            
Debt Instrument [Line Items]                            
Repayments of long-term debt   $ 45,000,000                        
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures issued August 2025 | Forecast                            
Debt Instrument [Line Items]                            
Aggregate principal amount                       $ 150,000,000    
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures maturing September 2030 | Forecast                            
Debt Instrument [Line Items]                            
Aggregate principal amount                       $ 68,000,000    
Interest rate                       5.41%    
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures maturing September 2035 | Forecast                            
Debt Instrument [Line Items]                            
Aggregate principal amount                       $ 43,000,000    
Interest rate                       6.01%    
Unsecured Debt | Duke Energy Kentucky | Senior Unsecured Debentures maturing September 2037 | Forecast                            
Debt Instrument [Line Items]                            
Aggregate principal amount                       $ 40,000,000    
Interest rate                       6.11%    
Line of Credit | Duke Energy Term Loan Facility                            
Debt Instrument [Line Items]                            
Facility term (in years)         2 years                  
Line of Credit | Duke Energy Carolinas | Duke Energy Term Loan Facility                            
Debt Instrument [Line Items]                            
Facility size         $ 700,000,000         700,000,000        
Extension period (in years)         6 months                  
Increase in term loan facility         $ 300,000,000                  
Borrowing amount       $ 100,000,000       $ 145,000,000 $ 455,000,000          
Line of Credit | Duke Energy Progress | Duke Energy Term Loan Facility                            
Debt Instrument [Line Items]                            
Facility size         $ 250,000,000         250,000,000        
Extension period (in years)         6 months                  
Increase in term loan facility         $ 150,000,000                  
Borrowing amount               65,000,000 185,000,000          
Line of Credit | Duke Energy Florida | Duke Energy Term Loan Facility                            
Debt Instrument [Line Items]                            
Facility size         $ 800,000,000         800,000,000        
Facility term (in years)         364 days                  
Extension period (in years)         4 months                  
Increase in term loan facility         $ 400,000,000                  
Borrowing amount               700,000,000 $ 100,000,000          
Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Facility size               $ 10,000,000,000   10,000,000,000     $ 9,000,000,000  
Revolving Credit Facility | Duke Energy Carolinas                            
Debt Instrument [Line Items]                            
Facility size                   1,000,000,000        
Revolving Credit Facility | Duke Energy Progress                            
Debt Instrument [Line Items]                            
Facility size                   1,125,000,000        
Revolving Credit Facility | Duke Energy Florida                            
Debt Instrument [Line Items]                            
Facility size                   $ 1,150,000,000        
Revolving Credit Facility | Line of Credit | Duke Energy (Parent) | Three-Year Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Facility size $ 1,000,000,000                          
Facility term (in years) 3 years                          
Unsecured Debt | Line of Credit | Duke Energy (Parent) | Term Loan Credit Facility                            
Debt Instrument [Line Items]                            
Facility size                           $ 1,400,000,000
Repayments of debt           $ 1,000,000,000 $ 400,000,000