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Summary of Significant Accounting Policies (Schedule of Cash and Cash Equivalents) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Current Assets    
Cash and cash equivalents $ 245 $ 314
Other 84 84
Other Noncurrent Assets    
Other 34 20
Total cash, cash equivalents and restricted cash 363 418
Duke Energy Carolinas    
Current Assets    
Cash and cash equivalents 3 6
Other 12 9
Other Noncurrent Assets    
Other 7 1
Total cash, cash equivalents and restricted cash 22 16
Progress Energy    
Current Assets    
Cash and cash equivalents 54 73
Other 71 76
Other Noncurrent Assets    
Other 14 11
Total cash, cash equivalents and restricted cash 139 160
Duke Energy Progress    
Current Assets    
Cash and cash equivalents 16 24
Other 38 40
Other Noncurrent Assets    
Other 7 5
Total cash, cash equivalents and restricted cash 61 69
Duke Energy Florida    
Current Assets    
Cash and cash equivalents 21 33
Other 34 35
Other Noncurrent Assets    
Other 7 7
Total cash, cash equivalents and restricted cash $ 62 $ 75