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Related-Party Transactions (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Virginia Electric and Power Company |  |  |
Related Party Transaction [Line Items] |  |  |
Commodity purchases from affiliates | $ 690 | $ 930 | $ 674
Services provided by affiliates | 503 | 450 | 453
Virginia Electric and Power Company | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Services provided to related parties | 24 | 24 | 25
Dominion Energy Gas Holdings, LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Services provided to related parties | 164 | 260 | 190
Commodity purchases from affiliates | 249 | 168 | 173
Services provided by affiliates | 226 | 169 | 193
Other receivables | 7 | 13 |
Other deferred charges and other assets | 12 |  |
Dominion Energy Gas Holdings, LLC | Affiliated Entity |  |  |
Related Party Transaction [Line Items] |  |  |
Services provided to related parties | 12 |  | $ 10
Imbalances receivable from affiliates | 8 | 16 |
Imbalances payable to affiliates | $ 1 | $ 4 |

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