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Income Taxes (Other Disclosures) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   $ 125 $ 126 $ 24
Unrecognized tax benefit increases       105
Gross decreases – tax positions in prior periods   (86) (2) (3)
Gross increases – current period tax positions   12 4  
Reduction due to lapse of statute of limitations     (3)  
Total changes   (74) (1) 102
Unrecognized tax benefits – December 31 $ 51 51 125 126
Amount that if recognized, would affect the effective tax rate or regulatory liability 47 47    
Federal capital gain 426      
Duke Energy Carolinas        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   10 8 6
Unrecognized tax benefit increases       2
Gross increases – current period tax positions   3 2  
Total changes   3 2 2
Unrecognized tax benefits – December 31 13 13 10 8
Amount that if recognized, would affect the effective tax rate or regulatory liability 13 13    
Progress Energy        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   10 9 9
Unrecognized tax benefit increases       1
Gross decreases – tax positions in prior periods       (1)
Gross increases – current period tax positions   5 1  
Total changes   5 1  
Unrecognized tax benefits – December 31 15 15 10 9
Amount that if recognized, would affect the effective tax rate or regulatory liability 14 14    
Duke Energy Progress        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   6 6 6
Unrecognized tax benefit increases       1
Gross decreases – tax positions in prior periods       (1)
Gross increases – current period tax positions   4    
Total changes   4    
Unrecognized tax benefits – December 31 10 10 6 6
Amount that if recognized, would affect the effective tax rate or regulatory liability 10 10    
Duke Energy Florida        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   3 3 3
Gross increases – current period tax positions   1    
Total changes   1    
Unrecognized tax benefits – December 31 4 4 3 3
Amount that if recognized, would affect the effective tax rate or regulatory liability 4 4    
Duke Energy Ohio        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   1 1 1
Unrecognized tax benefits – December 31 1 1 1 1
Amount that if recognized, would affect the effective tax rate or regulatory liability 1 1    
Duke Energy Indiana        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   1 1 1
Gross increases – current period tax positions   1    
Total changes   1    
Unrecognized tax benefits – December 31 2 2 1 1
Amount that if recognized, would affect the effective tax rate or regulatory liability 2 2    
Piedmont        
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized tax benefits – January 1   1 4 4
Gross increases – current period tax positions   3    
Reduction due to lapse of statute of limitations     (3)  
Total changes   3 (3)  
Unrecognized tax benefits – December 31 4 4 $ 1 $ 4
Amount that if recognized, would affect the effective tax rate or regulatory liability $ 4 $ 4