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Commitments and Contingencies (Narrative) (Details)
$ in Millions
Jun. 16, 2021
people
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 28, 2021
case
Texas Storm Uri Tort Litigation | Pending Litigation        
Loss Contingencies [Line Items]        
Loss contingency, pending claims, number | case       5
Duke Energy Carolinas | Ruben Villano, et al. v. Duke Energy Carolinas, LLC | Pending Litigation        
Loss Contingencies [Line Items]        
Number of individuals | people 9      
Number of survivors | people 4      
Number of deceased individuals | people 5      
Duke Energy Carolinas | Asbestos-related Injuries and Damages Claims        
Loss Contingencies [Line Items]        
Asbestos-related injuries and damages reserves | $   $ 436 $ 457  
Probable insurance recoveries | $   572 595  
Duke Energy and Duke Energy Carolinas | ASU 2016-13        
Loss Contingencies [Line Items]        
Reserve for credit losses for insurance receivables | $   $ 9 $ 12