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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Assets) (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] $ 604 $ 396
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 57 46
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 547 350
Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [2] 257 178
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 30 14
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 227 164
Commodity | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 114 117
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 13 9
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 101 108
Commodity | Over-the-counter | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [2] 84 111
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 10 6
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 74 105
Commodity | Exchange    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 22 49
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 18 24
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 4 25
Commodity | Exchange | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [2] 1 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 1 1
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 0 0
Interest rate | Over-the-counter    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [1] 468 230
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 26 13
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts 442 217
Interest rate | Over-the-counter | Virginia Electric and Power Company    
Offsetting Assets [Line Items]    
Gross Assets Presented in the Consolidated Balance Sheet [2] 172 66
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments 19 7
Gross Amounts Not Offset in the Consolidated Balance Sheet, Cash Collateral Received 0 0
Net Amounts $ 153 $ 59
[1] Excludes $12 million and $1 million of derivative assets at June 30, 2021 and December 31, 2020, respectively, which are not subject to master netting or similar arrangements.
[2] Excludes $26 million and $3 million of derivative assets at June 30, 2021 and December 31, 2020, respectively, which are not subject to master netting or similar arrangements.