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Regulatory Matters (Duke Energy Carolinas Narrative) (Details)
12 Months Ended 24 Months Ended
Feb. 01, 2026
USD ($)
Nov. 21, 2025
USD ($)
turbine
Rate
MW
Nov. 20, 2025
Nov. 11, 2025
USD ($)
Oct. 30, 2025
USD ($)
MW
Jul. 03, 2024
USD ($)
May 17, 2024
USD ($)
Jan. 04, 2024
Dec. 15, 2023
Aug. 22, 2023
USD ($)
Dec. 14, 2027
USD ($)
Nov. 19, 2027
USD ($)
Dec. 14, 2026
USD ($)
Nov. 19, 2026
USD ($)
Dec. 31, 2025
USD ($)
Dec. 14, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 14, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 19, 2027
USD ($)
Dec. 31, 2025
USD ($)
Dec. 01, 2025
turbine
Nov. 30, 2025
USD ($)
Mar. 21, 2025
USD ($)
Mar. 31, 2024
turbine
MW
Public Utilities, General Disclosures [Line Items]                                                  
Impairment of assets and other charges                             $ (4,000,000)   $ 38,000,000   $ 85,000,000            
Operation, maintenance and other                             6,698,000,000   5,389,000,000   5,625,000,000            
Capital expenditures                             14,002,000,000   12,263,000,000   12,622,000,000            
Other Noncurrent Assets: Regulatory assets                             14,379,000,000   14,220,000,000       $ 14,379,000,000        
Total noncurrent regulatory liabilities                             15,682,000,000   14,521,000,000       15,682,000,000        
Face amount of debt instrument issued                             7,005,000,000   7,740,000,000       7,005,000,000        
Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Impairment of assets and other charges                             (11,000,000)   31,000,000   44,000,000            
Operation, maintenance and other                             2,002,000,000   1,740,000,000   1,774,000,000            
Capital expenditures                             4,477,000,000   3,966,000,000   3,733,000,000            
Other Noncurrent Assets: Regulatory assets                             4,502,000,000   4,199,000,000       4,502,000,000        
Total noncurrent regulatory liabilities                             7,609,000,000   6,592,000,000       7,609,000,000        
Face amount of debt instrument issued                             2,243,000,000   1,000,000,000       2,243,000,000        
Duke Energy Carolinas | Hurricanes Helene, Debby and Milton                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Capital expenditures                             408,000,000                    
Estimated storm restoration costs                                         474,000,000        
Duke Energy Carolinas and Duke Energy Progress | Hurricanes Helene, Debby and Milton                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Capital expenditures                             507,000,000                    
Estimated storm restoration costs                                         762,000,000        
Duke Energy Progress                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Impairment of assets and other charges                             2,000,000   6,000,000   29,000,000            
Operation, maintenance and other                             1,455,000,000   1,388,000,000   1,379,000,000            
Capital expenditures                             3,428,000,000   2,803,000,000   $ 2,387,000,000            
Other Noncurrent Assets: Regulatory assets                             4,543,000,000   4,555,000,000       4,543,000,000        
Total noncurrent regulatory liabilities                             4,807,000,000   4,570,000,000       4,807,000,000        
Face amount of debt instrument issued                             2,561,000,000   $ 677,000,000       2,561,000,000        
Duke Energy Progress | Hurricanes Helene, Debby and Milton                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Capital expenditures                             99,000,000                    
Estimated storm restoration costs                                         288,000,000        
NCUC | Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Public Utilities, Combined Cycle Plants, in Megawatts | MW   850                                             850
Number of solar plants petition for approval | turbine   2                                       2     2
Retail revenue requirement   $ 154,000,000                                              
Increase in retail rate (percent) | Rate   2.30%                                              
PSCSC                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Public Utilities, Combined Cycle Plants, in Megawatts | MW         1,365                                        
PSCSC | Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Estimated cost of generation facilities to be built         $ 3,200,000,000                                        
Public Utilities, Combined Cycle Plants, in Megawatts | MW         1,170                                        
PSCSC | Duke Energy Carolinas | Hurricane Helene                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Storm reserves                                               $ 25,000,000  
Face amount of debt instrument issued                                             $ 561,000,000    
PSCSC | NCEMC                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Public Utilities, Combined Cycle Plants, in Megawatts | MW         100                                        
PSCSC | CEPC                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Public Utilities, Combined Cycle Plants, in Megawatts | MW         95                                        
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
MYRP period (in years)                   3 years                              
Settlement amount                   $ 19,500,000,000                              
Impairment of assets and other charges                             29,000,000                    
Operation, maintenance and other                             8,000,000                    
Approved rate increase (decrease) amount by state commission                               $ 174,000,000   $ 436,000,000              
Approved return on equity (as a percent)                 10.10%                                
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Equity                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Approved return on equity (as a percent)                 53.00%                                
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Approved rate increase (decrease) amount by state commission                     $ 768,000,000   $ 158,000,000                        
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Settlement amount                   $ 4,600,000,000                              
2025 North Carolina Rate Case | NCUC | Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Requested return on equity (as a percent)     10.95%                                            
Requested equity ratio (percent)     53.00%                                            
2025 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Requested rate increase (decrease)                       $ 275,000,000   $ 727,000,000           $ 1,000,000,000          
Requested rate increase (decrease), percent                                       15.00%          
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Settlement amount           $ 7,400,000,000                                      
Impairment of assets and other charges                             33,000,000                    
Operation, maintenance and other                             2,000,000                    
Approved rate increase (decrease) amount by state commission           $ 150,000,000 $ 240,000,000                                    
Approved return on equity (as a percent)             9.94%                                    
Customer giveback             $ 84,000,000                                    
Approved capital structure (as a percent)             51.21%                                    
Interest expense                             11,000,000                    
Proposed rate period (in years)               2 years                                  
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Carolinas | Natural Disasters and Other Casualty Events                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Storm reserves                             200,000,000           200,000,000        
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Carolinas | North Carolina Storms                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Total noncurrent regulatory liabilities                             136,000,000           136,000,000        
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Progress | Natural Disasters and Other Casualty Events                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Storm reserves                             100,000,000           100,000,000        
Hurricanes Helene, Debby and Milton | NCUC | Duke Energy Progress | North Carolina Storms                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Total noncurrent regulatory liabilities                             71,000,000           71,000,000        
Hurricanes Helene, Debby and Milton | PSCSC | Duke Energy Carolinas | Hurricane Helene                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Total noncurrent regulatory liabilities                             $ 35,000,000           $ 35,000,000        
2025 South Carolina Rate Case | PSCSC | Duke Energy Carolinas                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Approved rate increase (decrease) amount by state commission       $ 19,000,000                                          
Approved return on equity (as a percent)       9.99%                                          
Approved capital structure (as a percent)       53.00%                                          
2025 South Carolina Rate Case | PSCSC | Duke Energy Progress | Forecast | Subsequent Event                                                  
Public Utilities, General Disclosures [Line Items]                                                  
Approved rate increase (decrease) amount by state commission $ 40,000,000                                                
Approved return on equity (as a percent) 9.99%                                                
Approved capital structure (as a percent) 53.00%