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Condensed Consolidated Statements of Changes in Equity - Duke Energy Florida - USD ($)
$ in Millions
Total
Duke Energy Florida
Duke Energy Florida
Member's Equity
Duke Energy Florida
Net Unrealized Gains (Losses) on Available-for-Sale Securities
Beginning balance at Dec. 31, 2023   $ 10,043 $ 10,048 $ (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) $ 3,319 852 852  
Other comprehensive income (loss)   0    
Dividends to parent (2,392) (125) (125)  
Other (2) 2 2  
Ending balance at Sep. 30, 2024   10,772 10,777 (5)
Beginning balance at Jun. 30, 2024   10,550 10,555 (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) 1,281 364 364  
Other comprehensive income (loss)   0    
Dividends to parent (806) (125) (125)  
Other (3) (17) (17)  
Ending balance at Sep. 30, 2024   10,772 10,777 (5)
Beginning balance at Dec. 31, 2024   10,981 10,986 (5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) 3,784 975 975  
Other comprehensive income (loss)   (1)   (1)
Dividends to parent (2,460) (188) (188)  
Contributions from parent   138 138  
Other (2) (2) (2)  
Ending balance at Sep. 30, 2025   11,903 11,909 (6)
Beginning balance at Jun. 30, 2025   11,556 11,562 (6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Net income (loss) 1,421 397 397  
Other comprehensive income (loss)   0    
Dividends to parent $ (831) (188) (188)  
Contributions from parent   138 138  
Ending balance at Sep. 30, 2025   $ 11,903 $ 11,909 $ (6)