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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Investment Holdings [Line Items]        
Fixed income securities Fair Value $ 1,950,000,000 $ 1,950,000,000    
Amortized Cost, Total 3,798,000,000 3,798,000,000 $ 3,691,000,000  
Total Unrealized Gains 2,635,000,000 2,635,000,000 2,523,000,000  
Total Unrealized Losses [1] (76,000,000) (76,000,000) (22,000,000)  
Allowance for Credit Losses, Total 0 0 0 $ 0
Fair Value, Total 6,357,000,000 6,357,000,000 6,192,000,000  
Net assets related to pending sales and purchases of securities 36,000,000 36,000,000 1,000,000  
Fair value of securities in an unrealized loss position 523,000,000 523,000,000 298,000,000  
Virginia Electric and Power Company        
Investment Holdings [Line Items]        
Fixed income securities Fair Value 882,000,000 882,000,000    
Amortized Cost, Total 1,770,000,000 1,770,000,000 1,721,000,000  
Total Unrealized Gains 1,212,000,000 1,212,000,000 1,173,000,000  
Total Unrealized Losses [2] (49,000,000) (49,000,000) (13,000,000)  
Allowance for Credit Losses, Total 0 0 0 $ 0
Fair Value, Total 2,933,000,000 2,933,000,000 2,881,000,000  
Net assets related to pending sales and purchases of securities 5,000,000 5,000,000    
Fair value of securities in an unrealized loss position 283,000,000 283,000,000 185,000,000  
Decrease in allowance for credit loss 12,000,000      
Fixed Income        
Investment Holdings [Line Items]        
Allowance for Credit Losses, Total 21,000,000 21,000,000    
Common/collective trust funds | Fixed Income        
Investment Holdings [Line Items]        
Fixed income securities Amortized Cost, Total [3] 138,000,000 138,000,000 115,000,000  
Fixed income securities Total Unrealized Gains [3]   4,000,000 4,000,000  
Fixed income securities Total Unrealized Losses [3]   0 0  
Fixed income securities Allowance for Credit Losses [3] 0 0 0  
Fixed income securities Fair Value [3] 142,000,000 142,000,000 119,000,000  
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company        
Investment Holdings [Line Items]        
Fixed income securities Amortized Cost, Total [3] 45,000,000 45,000,000 51,000,000  
Fixed income securities Total Unrealized Gains [3]   0 0  
Fixed income securities Total Unrealized Losses [3]   0 0  
Fixed income securities Allowance for Credit Losses [3] 0 0 0  
Fixed income securities Fair Value [3] 45,000,000 45,000,000 51,000,000  
Equity securities: | U.S.        
Investment Holdings [Line Items]        
Equity securities Amortized Cost [4] 1,735,000,000 1,735,000,000 1,807,000,000  
Equity securities Total Unrealized Gains [4]   2,517,000,000 2,451,000,000  
Equity securities Total Unrealized Losses [4]   (73,000,000) (20,000,000)  
Equity securities Allowance for Credit Losses [4] 0 0 0  
Equity securities Fair Value [4] 4,179,000,000 4,179,000,000 4,238,000,000  
Equity securities: | U.S. | Virginia Electric and Power Company        
Investment Holdings [Line Items]        
Equity securities Amortized Cost [4] 919,000,000 919,000,000 894,000,000  
Equity securities Total Unrealized Gains [4]   1,161,000,000 1,144,000,000  
Equity securities Total Unrealized Losses [4]   (48,000,000) (11,000,000)  
Equity securities Allowance for Credit Losses [4] 0 0 0  
Equity securities Fair Value [4] 2,032,000,000 2,032,000,000 2,027,000,000  
Corporate debt instruments | Fixed Income        
Investment Holdings [Line Items]        
Fixed income securities Amortized Cost, Total [3] 569,000,000 569,000,000 434,000,000  
Fixed income securities Total Unrealized Gains [3]   49,000,000 29,000,000  
Fixed income securities Total Unrealized Losses [3]   (1,000,000) 0  
Fixed income securities Allowance for Credit Losses [3] 0 0 0  
Fixed income securities Fair Value [3] 617,000,000 617,000,000 463,000,000  
Corporate debt instruments | Fixed Income | Virginia Electric and Power Company        
Investment Holdings [Line Items]        
Fixed income securities Amortized Cost, Total [3] 324,000,000 324,000,000 241,000,000  
Fixed income securities Total Unrealized Gains [3]   28,000,000 15,000,000  
Fixed income securities Total Unrealized Losses [3]   0 0  
Fixed income securities Allowance for Credit Losses [3] 0 0 0  
Fixed income securities Fair Value [3] 352,000,000 352,000,000 256,000,000  
Government Securities | Fixed Income        
Investment Holdings [Line Items]        
Fixed income securities Amortized Cost, Total [3] 1,128,000,000 1,128,000,000 1,108,000,000  
Fixed income securities Total Unrealized Gains [3]   64,000,000 39,000,000  
Fixed income securities Total Unrealized Losses [3]   (1,000,000) (2,000,000)  
Fixed income securities Allowance for Credit Losses [3] 0 0 0  
Fixed income securities Fair Value [3] 1,191,000,000 1,191,000,000 1,145,000,000  
Government Securities | Fixed Income | Virginia Electric and Power Company        
Investment Holdings [Line Items]        
Fixed income securities Amortized Cost, Total [3] 463,000,000 463,000,000 534,000,000  
Fixed income securities Total Unrealized Gains [3]   23,000,000 14,000,000  
Fixed income securities Total Unrealized Losses [3]   (1,000,000) (2,000,000)  
Fixed income securities Allowance for Credit Losses [3] 0 0 0  
Fixed income securities Fair Value [3] 485,000,000 485,000,000 546,000,000  
Insurance Contracts        
Investment Holdings [Line Items]        
Fixed income securities Amortized Cost, Total 227,000,000 227,000,000 214,000,000  
Fixed income securities Total Unrealized Gains   0 0  
Fixed income securities Total Unrealized Losses   0 0  
Fixed income securities Allowance for Credit Losses 0 0 0  
Fixed income securities Fair Value 227,000,000 227,000,000 214,000,000  
Cash equivalents and other        
Investment Holdings [Line Items]        
Cash equivalents and other, Amortized Cost 1,000,000 1,000,000 13,000,000  
Cash equivalents and other, Total Unrealized Gains 1,000,000 1,000,000    
Cash equivalents and other, Total Unrealized Losses (1,000,000) (1,000,000)    
Cash equivalents and other, Allowance for Credit Losses 0 0 0  
Cash equivalents and other, Fair Value 1,000,000 1,000,000 13,000,000  
Cash equivalents and other | Virginia Electric and Power Company        
Investment Holdings [Line Items]        
Cash equivalents and other, Amortized Cost 19,000,000 19,000,000 1,000,000  
Cash equivalents and other, Allowance for Credit Losses 0 0 0  
Cash equivalents and other, Fair Value $ 19,000,000 $ 19,000,000 $ 1,000,000  
[1] The allowance for credit losses associated with fixed income securities decreased from March 31, 2020 by $21 million. These recoveries are a result of improvements in credit spreads experienced in the market between March 31, 2020 and June 30, 2020. There were no further changes in the allowance for credit losses between June 30, 2020 and September 30, 2020.     
[2] The allowance for credit losses associated with fixed income securities decreased from March 31, 2020 by $12 million. These recoveries are a result of improvements in credit spreads experienced in the market between March 31, 2020 and June 30, 2020. There were no further changes in the allowance for credit losses between June 30, 2020 and September 30, 2020.  
[3] Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability. Effective January 2020, changes in allowance for credit losses are included in other income.
[4] Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.