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Regulatory Matters (Duke Energy Florida Narrative) (Details)
$ in Millions
12 Months Ended
Jul. 15, 2024
solarFacility
Jul. 01, 2020
USD ($)
plant
MW
Dec. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jan. 15, 2025
USD ($)
Dec. 27, 2024
USD ($)
Aug. 01, 2024
USD ($)
Jul. 31, 2024
USD ($)
Public Utilities, General Disclosures [Line Items]                    
Other Noncurrent Assets: Regulatory assets       $ 14,379 $ 14,220          
Capital expenditures       14,002 12,263 $ 12,622        
Regulatory assets       1,934 2,739          
Duke Energy Florida                    
Public Utilities, General Disclosures [Line Items]                    
Other Noncurrent Assets: Regulatory assets       2,106 2,064          
Capital expenditures       2,698 2,449 $ 2,529        
Regulatory assets       102 1,022          
Duke Energy Florida | Natural Disasters and Other Casualty Events                    
Public Utilities, General Disclosures [Line Items]                    
Capital expenditures       75            
Regulatory assets       4 $ 936          
Duke Energy Florida | Solar Plant                    
Public Utilities, General Disclosures [Line Items]                    
Estimated cost of generation facilities to be built   $ 1,100                
Duke Energy Florida | FPSC                    
Public Utilities, General Disclosures [Line Items]                    
Number of solar plants petition for approval | plant   10                
Solar generation capacity plants (in MW) | MW   749                
Investment in transmission and distribution             $ 7,000      
Duke Energy Florida | Hurricane Ian | FPSC | Natural Disasters and Other Casualty Events                    
Public Utilities, General Disclosures [Line Items]                    
Storm reserves               $ 1,100 $ 132 $ 63
Duke Energy Florida | 2024 Florida Rate Case | FPSC                    
Public Utilities, General Disclosures [Line Items]                    
Requested rate increase (decrease)       $ (203)            
Number of solar plants petition for approval | solarFacility 12                  
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Forecast                    
Public Utilities, General Disclosures [Line Items]                    
Requested rate increase (decrease)     $ (59)              
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Minimum                    
Public Utilities, General Disclosures [Line Items]                    
Approved return on equity (as a percent) 9.30%                  
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Maximum                    
Public Utilities, General Disclosures [Line Items]                    
Approved return on equity (as a percent) 11.30%                  
Duke Energy Florida | 2024 Florida Rate Case | FPSC | Weighted Average                    
Public Utilities, General Disclosures [Line Items]                    
Approved return on equity (as a percent) 10.30%                  
Approved capital structure (as a percent) 53.00%