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Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Investment Holdings [Line Items]      
Fixed income securities Fair Value $ 1,952 $ 1,952  
Amortized Cost, Total 3,758 3,758 $ 3,691
Total Unrealized Gains 2,335 2,335 2,523
Total Unrealized Losses [1] (75) (75) (22)
Allowance for Credit Losses, Total 0 0 0
Fair Value, Total 6,018 6,018 6,192
Net assets related to pending purchases of securities 35 35 1
Fair value of securities in an unrealized loss position 181 181 298
Virginia Electric and Power Company      
Investment Holdings [Line Items]      
Fixed income securities Fair Value 900 900  
Amortized Cost, Total 1,752 1,752 1,721
Total Unrealized Gains 1,077 1,077 1,173
Total Unrealized Losses [2] (47) (47) (13)
Allowance for Credit Losses, Total 0 0 0
Fair Value, Total 2,782 2,782 2,881
Net assets related to pending purchases of securities 1 1  
Fair value of securities in an unrealized loss position 74 74 185
Decrease in allowance for credit losses 12    
Fixed Income      
Investment Holdings [Line Items]      
Cash equivalents and other, Amortized Cost [3] (8) (8) 13
Cash equivalents and other, Total Unrealized Gains [3] 2 2  
Cash equivalents and other, Total Unrealized Losses [3] (2) (2)  
Cash equivalents and other, Allowance for Credit Losses [3] 0 0 0
Cash equivalents and other, Fair Value [3] (8) (8) 13
Decrease in allowance for credit losses 21    
Common/collective trust funds | Fixed Income      
Investment Holdings [Line Items]      
Fixed income securities Amortized Cost, Total [4] 146 146 115
Fixed income securities Total Unrealized Gains [4]   2 4
Fixed income securities Total Unrealized Losses [4]   0 0
Fixed income securities Allowance for Credit Losses [4] 0 0 0
Fixed income securities Fair Value [4] 148 148 119
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company      
Investment Holdings [Line Items]      
Fixed income securities Amortized Cost, Total [4] 57 57 51
Fixed income securities Total Unrealized Gains [4]   0 0
Fixed income securities Total Unrealized Losses [4]   0 0
Fixed income securities Allowance for Credit Losses [4] 0 0 0
Fixed income securities Fair Value [4] 57 57 51
Equity securities: | U.S.      
Investment Holdings [Line Items]      
Equity securities Amortized Cost [5] 1,701 1,701 1,807
Equity securities Total Unrealized Gains [5]   2,221 2,451
Equity securities Total Unrealized Losses [5]   (71) (20)
Equity securities Allowance for Credit Losses [5] 0 0 0
Equity securities Fair Value [5] 3,851 3,851 4,238
Equity securities: | U.S. | Virginia Electric and Power Company      
Investment Holdings [Line Items]      
Equity securities Amortized Cost [5] 901 901 894
Equity securities Total Unrealized Gains [5]   1,028 1,144
Equity securities Total Unrealized Losses [5]   (46) (11)
Equity securities Allowance for Credit Losses [5] 0 0 0
Equity securities Fair Value [5] 1,883 1,883 2,027
Corporate debt instruments | Fixed Income      
Investment Holdings [Line Items]      
Fixed income securities Amortized Cost, Total [4] 577 577 434
Fixed income securities Total Unrealized Gains [4]   48 29
Fixed income securities Total Unrealized Losses [4]   (1) 0
Fixed income securities Allowance for Credit Losses [4] 0 0 0
Fixed income securities Fair Value [4] 624 624 463
Corporate debt instruments | Fixed Income | Virginia Electric and Power Company      
Investment Holdings [Line Items]      
Fixed income securities Amortized Cost, Total [4] 328 328 241
Fixed income securities Total Unrealized Gains [4]   26 15
Fixed income securities Total Unrealized Losses [4]   0 0
Fixed income securities Allowance for Credit Losses [4] 0 0 0
Fixed income securities Fair Value [4] 354 354 256
Government Securities | Fixed Income      
Investment Holdings [Line Items]      
Fixed income securities Amortized Cost, Total [4] 1,119 1,119 1,108
Fixed income securities Total Unrealized Gains [4]   62 39
Fixed income securities Total Unrealized Losses [4]   (1) (2)
Fixed income securities Allowance for Credit Losses [4] 0 0 0
Fixed income securities Fair Value [4] 1,180 1,180 1,145
Government Securities | Fixed Income | Virginia Electric and Power Company      
Investment Holdings [Line Items]      
Fixed income securities Amortized Cost, Total [4] 467 467 534
Fixed income securities Total Unrealized Gains [4]   23 14
Fixed income securities Total Unrealized Losses [4]   (1) (2)
Fixed income securities Allowance for Credit Losses [4] 0 0 0
Fixed income securities Fair Value [4] 489 489 546
Insurance Contracts      
Investment Holdings [Line Items]      
Fixed income securities Amortized Cost, Total 223 223 214
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 223 223 214
Cash equivalents and other | Virginia Electric and Power Company      
Investment Holdings [Line Items]      
Cash equivalents and other, Amortized Cost (1) [6] (1) [6] 1
Cash equivalents and other, Allowance for Credit Losses 0 [6] 0 [6] 0
Cash equivalents and other, Fair Value $ (1) [6] $ (1) [6] $ 1
[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.     
[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.     
[3] Includes pending purchases of securities of $35 million and $1 million at June 30, 2020 and December 31, 2019, respectively.
[4] 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.
[5] Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.
[6] Includes pending purchases of securities of $1 million at June 30, 2020.