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Organization and Basis of Presentation (Schedule of Cash and Cash Equivalents) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Current Assets        
Cash and cash equivalents $ 390 $ 253    
Other Noncurrent Assets        
Total cash, cash equivalents and restricted cash 483 357 $ 567 $ 603
Duke Energy (Parent)        
Current Assets        
Cash and cash equivalents 390 253    
Other 74 76    
Other Noncurrent Assets        
Other 18 16    
Total cash, cash equivalents and restricted cash 482 345    
Duke Energy Carolinas        
Current Assets        
Cash and cash equivalents 9 9    
Other 10 9    
Other Noncurrent Assets        
Other 1 1    
Total cash, cash equivalents and restricted cash 20 19 29 53
Progress Energy        
Current Assets        
Cash and cash equivalents 85 59    
Other 64 67    
Other Noncurrent Assets        
Other 11 9    
Total cash, cash equivalents and restricted cash 160 135 146 184
Duke Energy Progress        
Current Assets        
Cash and cash equivalents 33 18    
Other 32 31    
Other Noncurrent Assets        
Other 5 2    
Total cash, cash equivalents and restricted cash 70 51 50 79
Duke Energy Florida        
Current Assets        
Cash and cash equivalents 35 24    
Other 32 36    
Other Noncurrent Assets        
Other 6 7    
Total cash, cash equivalents and restricted cash $ 73 $ 67 $ 73 $ 86