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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2022
USD ($)
Jul. 31, 2020
USD ($)
plant
MW
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Jan. 31, 2025
USD ($)
Aug. 01, 2024
USD ($)
Jul. 31, 2024
USD ($)
Apr. 30, 2022
USD ($)
Public Utilities, General Disclosures [Line Items]                  
Capital expenditures     $ 3,148 $ 3,215          
Regulatory assets     14,200   $ 14,254        
Duke Energy Florida                  
Public Utilities, General Disclosures [Line Items]                  
Capital expenditures     559 $ 669          
Regulatory assets     2,068   2,064        
Duke Energy Florida | Hurricane Ian                  
Public Utilities, General Disclosures [Line Items]                  
Capital expenditures         74        
Regulatory assets     $ 813   936        
Duke Energy Florida | Solar Project                  
Public Utilities, General Disclosures [Line Items]                  
Estimated cost of facilities   $ 1,100              
FPSC | Duke Energy Florida                  
Public Utilities, General Disclosures [Line Items]                  
Number of solar plants | plant   10              
Generation capacity (MW) | MW   749              
Storm Protection Plan | FPSC | Duke Energy Florida                  
Public Utilities, General Disclosures [Line Items]                  
Investment in transmission and distribution           $ 7,000     $ 7,000
Cost reduction to transmission loop $ 80                
Cost reduction period (in years) 10 years                
Hurricane Ian | FPSC | Duke Energy Florida | Hurricane Ian                  
Public Utilities, General Disclosures [Line Items]                  
Storm reserves         $ 1,100   $ 132 $ 63