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Fair Value Measurements (Narrative) (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Net Income (Loss) From Discontinued Operations [1] $ (554,000,000)     $ 152,000,000 $ (105,000,000) $ 775,000,000
Net Income (Loss) From Discontinued Operations, after tax (554,000,000)     152,000,000 (105,000,000) 775,000,000
Unrealized gains or losses included in operating revenue in Level 3 fair value category (10,000,000)     0 (8,000,000) 0
Level 3 | Corporate Office Building            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-lived assets, estimated fair value     $ 35,000,000      
Impairment of Assets and Other Charges | Corporate Office Building            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of assets and other charges     91,000,000      
Asset impairment charges after tax     $ 68,000,000      
Virginia Electric and Power Company            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Unrealized gains or losses included in operating revenue in Level 3 fair value category $ 0     $ 0 $ 0 $ 0
Nonregulated Solar Assets            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Net Income (Loss) From Discontinued Operations   $ 15,000,000        
Net Income (Loss) From Discontinued Operations, after tax   11,000,000        
Nonregulated Solar Assets | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-lived assets, estimated fair value   $ 22,000,000        
[1] Includes income tax expense of $1.2 billion and $53 million for the three months ended September 30, 2023 and 2022, respectively, and $1.3 billion and $185 million for the nine months ended September 30, 2023 and 2022, respectively.