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Income Taxes (Other Disclosures) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 $ 74 $ 62 $ 65
Gross decreases – tax positions in prior periods (2)   (15)
Gross increases – current period tax positions   12 12
Total changes     (3)
Unrecognized tax benefits – December 31 72 74 62
Amount that if recognized, would affect the effective tax rate or regulatory liability 67    
Valuation allowance 130 517  
Foreign Tax Credit      
Unrecognized Tax Benefits [Roll Forward]      
Valuation allowance 36    
Duke Energy Carolinas      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 25 21 17
Gross increases – current period tax positions   4 4
Total changes     4
Unrecognized tax benefits – December 31 25 25 21
Amount that if recognized, would affect the effective tax rate or regulatory liability 24    
Valuation allowance 1    
Progress Energy      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 29 24 19
Gross decreases – tax positions in prior periods (1)    
Gross increases – current period tax positions   5 5
Total changes     5
Unrecognized tax benefits – December 31 28 29 24
Amount that if recognized, would affect the effective tax rate or regulatory liability 26    
Duke Energy Progress      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 22 18 13
Gross decreases – tax positions in prior periods (2)    
Gross increases – current period tax positions   4 5
Total changes     5
Unrecognized tax benefits – December 31 20 22 18
Amount that if recognized, would affect the effective tax rate or regulatory liability 18    
Duke Energy Florida      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 7 6 5
Gross increases – current period tax positions 1 1 1
Total changes     1
Unrecognized tax benefits – December 31 8 7 6
Amount that if recognized, would affect the effective tax rate or regulatory liability 8    
Duke Energy Ohio      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 2 2 1
Gross increases – current period tax positions     1
Total changes     1
Unrecognized tax benefits – December 31 2 2 2
Amount that if recognized, would affect the effective tax rate or regulatory liability 2    
Duke Energy Indiana      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 3 3 2
Gross increases – current period tax positions     1
Total changes     1
Unrecognized tax benefits – December 31 3 3 3
Amount that if recognized, would affect the effective tax rate or regulatory liability 3    
Piedmont      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 13 11 9
Gross decreases – tax positions in prior periods (1)    
Gross increases – current period tax positions   2 2
Total changes     2
Unrecognized tax benefits – December 31 12 $ 13 $ 11
Amount that if recognized, would affect the effective tax rate or regulatory liability $ 11