v3.26.1
Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details)
Mcf in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
GWh
Mcf
Dec. 31, 2024
GWh
Mcf
Dec. 31, 2025
USD ($)
Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 7,327   $ 5,577
Commodity contracts | Electricity (GWh)      
Derivative [Line Items]      
Notional amount, energy measure (in gigawatt-hours) | GWh 3,965 10,615  
Commodity contracts | Natural gas (millions of dekatherms)      
Derivative [Line Items]      
Notional amount, volume (in millions of dekatherms) | Mcf 811 814  
Designated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 1,950   1,725
Undesignated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 5,377   3,852
Duke Energy Carolinas | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 3,275   2,175
Duke Energy Carolinas | Commodity contracts | Electricity (GWh)      
Derivative [Line Items]      
Notional amount, energy measure (in gigawatt-hours) | GWh 0 0  
Duke Energy Carolinas | Commodity contracts | Natural gas (millions of dekatherms)      
Derivative [Line Items]      
Notional amount, volume (in millions of dekatherms) | Mcf 309 307  
Duke Energy Carolinas | Designated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 0   0
Duke Energy Carolinas | Undesignated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 3,275   2,175
Progress Energy | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 1,850   1,325
Progress Energy | Commodity contracts | Electricity (GWh)      
Derivative [Line Items]      
Notional amount, energy measure (in gigawatt-hours) | GWh 0 0  
Progress Energy | Commodity contracts | Natural gas (millions of dekatherms)      
Derivative [Line Items]      
Notional amount, volume (in millions of dekatherms) | Mcf 286 286  
Progress Energy | Designated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 0   0
Progress Energy | Undesignated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 1,850   1,325
Duke Energy Progress | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 650   650
Duke Energy Progress | Commodity contracts | Electricity (GWh)      
Derivative [Line Items]      
Notional amount, energy measure (in gigawatt-hours) | GWh 0 0  
Duke Energy Progress | Commodity contracts | Natural gas (millions of dekatherms)      
Derivative [Line Items]      
Notional amount, volume (in millions of dekatherms) | Mcf 286 286  
Duke Energy Progress | Designated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 0   0
Duke Energy Progress | Undesignated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 650   650
Duke Energy Florida | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 1,200   675
Duke Energy Florida | Designated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 0   0
Duke Energy Florida | Undesignated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 1,200   675
Duke Energy Indiana | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 225   325
Duke Energy Indiana | Commodity contracts | Electricity (GWh)      
Derivative [Line Items]      
Notional amount, energy measure (in gigawatt-hours) | GWh 3,423 9,266  
Duke Energy Indiana | Commodity contracts | Natural gas (millions of dekatherms)      
Derivative [Line Items]      
Notional amount, volume (in millions of dekatherms) | Mcf 31 33  
Duke Energy Indiana | Designated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 0   0
Duke Energy Indiana | Undesignated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount 225   325
Duke Energy Ohio | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 27   27
Duke Energy Ohio | Commodity contracts | Electricity (GWh)      
Derivative [Line Items]      
Notional amount, energy measure (in gigawatt-hours) | GWh 542 1,349  
Duke Energy Ohio | Commodity contracts | Natural gas (millions of dekatherms)      
Derivative [Line Items]      
Notional amount, volume (in millions of dekatherms) | Mcf 0 0  
Duke Energy Ohio | Designated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 0   0
Duke Energy Ohio | Undesignated contracts | Interest Rate Contracts      
Derivative [Line Items]      
Notional amount $ 27   $ 27
Piedmont | Commodity contracts | Electricity (GWh)      
Derivative [Line Items]      
Notional amount, energy measure (in gigawatt-hours) | GWh 0 0  
Piedmont | Commodity contracts | Natural gas (millions of dekatherms)      
Derivative [Line Items]      
Notional amount, volume (in millions of dekatherms) | Mcf 185 188