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Fair Value Measurements (Other Fair Value Disclosures) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value $ 87,212 $ 80,689
Fair Value 79,863 73,440
Unamortized debt discount and premium, net 921 1,000
Duke Energy Carolinas    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 18,777 17,490
Fair Value 16,764 15,975
Progress Energy    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 26,848 24,496
Fair Value 24,957 22,548
Duke Energy Progress    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 13,896 12,504
Fair Value 12,445 11,009
Duke Energy Florida    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 11,307 10,348
Fair Value 10,720 9,752
Duke Energy Ohio    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 4,420 4,165
Fair Value 4,151 3,871
Duke Energy Indiana    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 5,093 4,798
Fair Value 4,646 4,329
Piedmont    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Book Value 4,251 4,003
Fair Value $ 3,960 $ 3,584