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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Progress) (Details) - Duke Energy Progress
$ in Millions
May 21, 2021
USD ($)
Apr. 16, 2021
USD ($)
Oct. 16, 2020
Oct. 30, 2019
USD ($)
Oct. 11, 2019
May 21, 2019
USD ($)
Nov. 08, 2018
USD ($)
Nov. 22, 2017
Jun. 01, 2017
USD ($)
Jul. 27, 2020
MW
Western Carolinas Modernization Plan                    
Public Utilities, General Disclosures [Line Items]                    
Generation capacity (MW) | MW                   5
NCUC | 2017 North Carolina Rate Case                    
Public Utilities, General Disclosures [Line Items]                    
Requested rate increase (decrease), amount                 $ 477  
Requested rate increase (decrease), amended amount                 $ 420  
Requested return on equity, percent               9.90%    
Public utilities, requested equity capital structure, percentage               52.00%    
Public utilities, requested debt capital structure, percentage               48.00%    
NCUC | 2019 North Carolina Rate Case                    
Public Utilities, General Disclosures [Line Items]                    
Requested rate increase (decrease), amount       $ 464            
Requested rate increase, percentage       12.30%            
Requested rate increase (decrease), gross amount       $ 586            
Rider reduction       122            
Requested rate increase (decrease), rider reduction       $ 120            
Approved rate increase, amount $ 178                  
NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement                    
Public Utilities, General Disclosures [Line Items]                    
Approved return on equity percentage   9.60%                
Public utilities, approved equity capital structure, percentage   52.00%                
Public utilities, approved debt capital structure, percentage   48.00%                
PSCSC | South Carolina Rate Case 2018                    
Public Utilities, General Disclosures [Line Items]                    
Requested rate increase (decrease), amount             $ 59      
Approved return on equity percentage           9.50%        
Public utilities, approved equity capital structure, percentage           53.00%        
Public utilities, approved debt capital structure, percentage           47.00%        
Change in tax rate, deferred tax liability, income tax benefit           $ 17        
Measurement period adjustment, income tax expense (benefit)           12        
FERC | FERC Return on Equity Complaint, NCEMPA                    
Public Utilities, General Disclosures [Line Items]                    
Approved return on equity percentage         11.00%          
FERC | FERC Return on Equity Complaint, NCEMC                    
Public Utilities, General Disclosures [Line Items]                    
Approved return on equity percentage     11.00%              
State and local jurisdiction | North Carolina Department of Revenue | PSCSC | South Carolina Rate Case 2018                    
Public Utilities, General Disclosures [Line Items]                    
State and local taxes increase amount           12        
Grid Improvement | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory assets   $ 400                
Storm costs | NCUC | 2019 North Carolina Rate Case, additional Agreement and Stipulation of Partial Settlement                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory assets   $ 714                
Asset retirement obligations - coal ash | PSCSC | South Carolina Rate Case 2018                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory assets           $ 4        
Regulatory asset, amortization period           5 years        
Recovery costs denied           $ 65        
Asset retirement obligations - unprotected EDIT, Property, Plant and Equipment | PSCSC | South Carolina Rate Case 2018                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory asset, amortization period           20 years        
Asset retirement obligations - unprotected EDIT | PSCSC | South Carolina Rate Case 2018                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory asset, amortization period           5 years        
Asset retirement obligations - deferred revenue | PSCSC | South Carolina Rate Case 2018                    
Public Utilities, General Disclosures [Line Items]                    
Regulatory asset, amortization period           3 years