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Income Taxes (Other Disclosures) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 $ 62 $ 65 $ 51
Gross decreases – tax positions in prior periods   (15)  
Gross increases – current period tax positions 12 12 14
Total changes   (3) 14
Unrecognized tax benefits – December 31 74 62 65
Amount that if recognized, would affect the effective tax rate or regulatory liability 68    
Valuation allowance 517 544  
Foreign Tax Credit      
Unrecognized Tax Benefits [Roll Forward]      
Valuation allowance 404    
Duke Energy Carolinas      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 21 17 13
Gross increases – current period tax positions 4 4 4
Total changes   4 4
Unrecognized tax benefits – December 31 25 21 17
Amount that if recognized, would affect the effective tax rate or regulatory liability 24    
Progress Energy      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 24 19 15
Gross increases – current period tax positions 5 5 4
Total changes   5 4
Unrecognized tax benefits – December 31 29 24 19
Amount that if recognized, would affect the effective tax rate or regulatory liability 27    
Duke Energy Progress      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 18 13 10
Gross increases – current period tax positions 4 5 3
Total changes   5 3
Unrecognized tax benefits – December 31 22 18 13
Amount that if recognized, would affect the effective tax rate or regulatory liability 20    
Duke Energy Florida      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 6 5 4
Gross increases – current period tax positions 1 1 1
Total changes   1 1
Unrecognized tax benefits – December 31 7 6 5
Amount that if recognized, would affect the effective tax rate or regulatory liability 7    
Duke Energy Ohio      
Unrecognized Tax Benefits [Roll Forward]      
Unrecognized tax benefits – January 1 2 1 1
Gross increases – current period tax positions   1  
Total changes   1  
Unrecognized tax benefits – December 31 2 2 1
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 2 2
Gross increases – current period tax positions   1  
Total changes   1  
Unrecognized tax benefits – December 31 3 3 2
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 11 9 4
Gross increases – current period tax positions 2 2 5
Total changes   2 5
Unrecognized tax benefits – December 31 13 $ 11 $ 9
Amount that if recognized, would affect the effective tax rate or regulatory liability $ 11