v3.26.1
Regulatory Matters (Regulatory Matters Narrative - Duke Energy Florida) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2026
Mar. 31, 2026
Feb. 27, 2026
Dec. 31, 2025
Dec. 31, 2024
Aug. 01, 2024
Jul. 31, 2024
Public Utilities, General Disclosures [Line Items]              
Regulatory assets $ 15,059 $ 15,059   $ 14,379      
Duke Energy Florida              
Public Utilities, General Disclosures [Line Items]              
Regulatory assets 2,130 2,130   $ 2,106      
Duke Energy Florida | Natural Disasters and Other Casualty Events              
Public Utilities, General Disclosures [Line Items]              
Capital expenditures   $ 75          
Refund requested $ 91            
Hurricane Ian | FPSC | Duke Energy Florida | Hurricanes Helene, Debby and Milton              
Public Utilities, General Disclosures [Line Items]              
Storm reserves     $ 903   $ 1,100 $ 132 $ 63