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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value $ 80,689 $ 75,252
Fair Value 73,440 69,790
Unamortized debt discount and premium, net 1,000  
Duke Energy Carolinas    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 17,490 16,012
Fair Value 15,975 15,077
Progress Energy    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 24,496 23,759
Fair Value 22,548 22,553
Duke Energy Progress    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 12,504 11,714
Fair Value 11,009 10,595
Duke Energy Florida    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 10,348 10,401
Fair Value 9,752 10,123
Duke Energy Ohio    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 4,165 3,518
Fair Value 3,871 3,310
Duke Energy Indiana    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 4,798 4,502
Fair Value 4,329 4,230
Piedmont    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 4,003 3,668
Fair Value $ 3,584 $ 3,336