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Income Taxes (Income Taxes Paid) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) $ 58    
Transferrable Credits – purchased/(sold) (676)    
Total Federal (618)    
Total State (7)    
Total Income Taxes Paid (net of refunds) (625) $ (400) $ 1
North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State (4)    
South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 1    
Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State (4)    
Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Carolinas      
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) 561    
Transferrable Credits – purchased/(sold) (551)    
Total Federal 10    
Total State 75    
Total Income Taxes Paid (net of refunds) 85 (85) 151
Duke Energy Carolinas | North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 39    
Duke Energy Carolinas | South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 36    
Duke Energy Carolinas | Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Carolinas | Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Carolinas | Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Carolinas | Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Carolinas | Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Progress Energy      
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) 424    
Transferrable Credits – purchased/(sold) (171)    
Total Federal 253    
Total State 12    
Total Income Taxes Paid (net of refunds) 265 315 310
Progress Energy | North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 7    
Progress Energy | South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Progress Energy | Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 5    
Progress Energy | Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Progress Energy | Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Progress Energy | Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Progress Energy | Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Progress      
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) 211    
Transferrable Credits – purchased/(sold) (102)    
Total Federal 109    
Total State 11    
Total Income Taxes Paid (net of refunds) 120 192 73
Duke Energy Progress | North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 9    
Duke Energy Progress | South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 2    
Duke Energy Progress | Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Progress | Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Progress | Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Progress | Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Progress | Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) 202    
Transferrable Credits – purchased/(sold) (69)    
Total Federal 133    
Total State 34    
Total Income Taxes Paid (net of refunds) 167 270 219
Duke Energy Florida | North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Florida | South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Florida | Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 34    
Duke Energy Florida | Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Florida | Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Florida | Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Florida | Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Ohio      
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) 100    
Transferrable Credits – purchased/(sold) 0    
Total Federal 100    
Total State 3    
Total Income Taxes Paid (net of refunds) 103 (79) 58
Duke Energy Ohio | North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Ohio | South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Ohio | Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Ohio | Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Ohio | Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 3    
Duke Energy Ohio | Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Ohio | Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) 182    
Transferrable Credits – purchased/(sold) 0    
Total Federal 182    
Total State 26    
Total Income Taxes Paid (net of refunds) 208 (80) 90
Duke Energy Indiana | North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Indiana | South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Indiana | Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Indiana | Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 26    
Duke Energy Indiana | Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Indiana | Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Duke Energy Indiana | Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Piedmont      
Effective Income Tax Rate Reconciliation [Line Items]      
Internal Revenue Service – payments/(refunds) 55    
Transferrable Credits – purchased/(sold) 0    
Total Federal 55    
Total State 0    
Total Income Taxes Paid (net of refunds) 55 $ 48 $ 28
Piedmont | North Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Piedmont | South Carolina      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Piedmont | Florida      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Piedmont | Indiana      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Piedmont | Kentucky      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Piedmont | Oklahoma      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State 0    
Piedmont | Other      
Effective Income Tax Rate Reconciliation [Line Items]      
Total State $ 0