v3.25.2
Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2022
USD ($)
Jul. 31, 2020
USD ($)
plant
MW
Jun. 30, 2025
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]                
Regulatory assets     $ 14,172 $ 14,254        
Duke Energy Florida                
Public Utilities, General Disclosures [Line Items]                
Regulatory assets     2,105 2,064        
Duke Energy Florida | Hurricanes Helene, Debby and Milton                
Public Utilities, General Disclosures [Line Items]                
Regulatory assets     $ 454 936        
Capital expenditures       81        
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]                
Cost reduction period (in years) 10 years   10 years          
Investment in transmission and distribution         $ 7,000     $ 7,000
Cost reduction to transmission loop $ 80              
Hurricane Ian | FPSC | Duke Energy Florida | Hurricanes Helene, Debby and Milton                
Public Utilities, General Disclosures [Line Items]                
Storm reserves       $ 1,100   $ 132 $ 63