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Variable Interest Entities - (Narrative) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Oct. 31, 2024
Feb. 29, 2024
Dec. 31, 2021
Variable Interest Entity [Line Items]            
Cash and cash equivalents [1] $ 310 $ 184        
Customer receivables [1] 2,169 2,251        
Regulatory assets-current [1] 992 1,309        
Prepayments [1] 315 246        
Property, plant and equipment 68,862 58,780        
Other current assets [1] 165 175        
Regulatory assets-noncurrent [1] 8,288 8,356        
Securities due within one year [2] 1,725 6,589        
Other deferred charges and other assets [1] 1,620 1,507        
Accrued interest, payroll and taxes [2] 1,045 1,075        
Other current liabilities [3] 2,084 1,732        
Long-term debt 37,525 33,248        
Asset retirement obligations [2] 7,074 5,641        
Virginia Electric and Power Company            
Variable Interest Entity [Line Items]            
Cash and cash equivalents 160 [4] 90 [4] $ 22     $ 26
Customer receivables [4] 1,612 1,728        
Regulatory assets-current [4] 697 868        
Prepayments [4] 64 46        
Property, plant and equipment 52,517 43,867        
Other current assets [4] 129 60        
Regulatory assets-noncurrent [4] 4,537 4,317        
Securities due within one year [5] 548 381        
Other deferred charges and other assets [4],[6] 1,308 1,160        
Accrued interest, payroll and taxes [5] 366 293        
Other current liabilities 1,228 908        
Long-term debt 20,038 17,115        
Asset retirement obligations [5] $ 5,076 4,276        
Virginia Electric and Power Company | CVOW Commercial Project            
Variable Interest Entity [Line Items]            
Ownership percentage       50.00% 50.00%  
Variable Interest Entity Not Primary Beneficiary | Distribution | Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline            
Variable Interest Entity [Line Items]            
Initial membership interest percentage 53.00%          
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company            
Variable Interest Entity [Line Items]            
Regulatory assets-current $ 124          
Other current assets 41          
Regulatory assets-noncurrent 1,000          
Securities due within one year 163          
Accrued interest, payroll and taxes 10          
Long-term debt 1,100          
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES            
Variable Interest Entity [Line Items]            
Shared Services Purchased 494 463 $ 396      
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party            
Variable Interest Entity [Line Items]            
Other current liabilities 38 $ 32        
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | Maximum            
Variable Interest Entity [Line Items]            
Prepayments 1          
Other deferred charges and other assets 1          
Variable Interest Entity Not Primary Beneficiary | OSWP            
Variable Interest Entity [Line Items]            
Cash and cash equivalents 70          
Regulatory assets-current 6          
Prepayments 10          
Property, plant and equipment 5,800          
Regulatory assets-noncurrent 52          
Asset retirement obligations 38          
Variable Interest Entity Not Primary Beneficiary | OSWP | Maximum            
Variable Interest Entity [Line Items]            
Customer receivables 1          
Accrued interest, payroll and taxes $ 1          
[1] See Note 16 for amounts attributable to VIEs.
[2] See Note 16 for amounts attributable to VIEs.
[3] See Note 9 for amounts attributable to related parties.
[4] See Note 16 for amounts attributable to VIEs.
[5] See Note 16 for amounts attributable to VIEs.
[6] See Note 25 for amounts attributable to affiliates.