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Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Current Assets        
Cash and cash equivalents $ 475 $ 314    
Other Noncurrent Assets        
Total cash, cash equivalents and restricted cash 536 421 $ 518 $ 357
Duke Energy (Parent)        
Current Assets        
Cash and cash equivalents 475 314    
Other 39 84    
Other Noncurrent Assets        
Other 22 20    
Total cash, cash equivalents and restricted cash 536 418    
Duke Energy Carolinas        
Current Assets        
Cash and cash equivalents 46 6    
Other 6 9    
Other Noncurrent Assets        
Other 1 1    
Total cash, cash equivalents and restricted cash 53 16 12 19
Progress Energy        
Current Assets        
Cash and cash equivalents 87 73    
Other 34 76    
Other Noncurrent Assets        
Other 11 11    
Total cash, cash equivalents and restricted cash 132 160 86 135
Duke Energy Progress        
Current Assets        
Cash and cash equivalents 53 24    
Other 23 40    
Other Noncurrent Assets        
Other 5 5    
Total cash, cash equivalents and restricted cash 81 69 49 51
Duke Energy Florida        
Current Assets        
Cash and cash equivalents 16 33    
Other 10 35    
Other Noncurrent Assets        
Other 7 7    
Total cash, cash equivalents and restricted cash $ 33 $ 75 $ 20 $ 67