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Credit Risk (Narrative) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) Customer | Dec. 31, 2018 USD ($)
Concentration Risk And Guarantor Obligations [Line Items] |  |
Gross credit exposure | $ 233 |
Additional collateral to be posted if the credit related contingent features were triggered | 10 | $ 1
Aggregate fair value of all derivative instruments with credit contingent provisions that are in a liability position | 10 | $ 1
Virginia Electric and Power Company |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Gross credit exposure | 71 |
Additional collateral to be posted if the credit related contingent features were triggered | 8 |
Dominion Energy Gas Holdings, LLC |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Gross credit exposure | $ 46 |
Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Largest Customer |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 17.00% | 12.00%
Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Export Customers |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 34.00% | 32.00%
Credit Concentration Risk |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Amount of exposure for single counterparty | $ 61 |
Credit Concentration Risk | Virginia Electric and Power Company |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 96.00% |
Amount of exposure for single counterparty | $ 61 |
Credit Concentration Risk | Dominion Energy Gas Holdings, LLC |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Amount of exposure for single counterparty | $ 9 |
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 88.00% |
Credit Concentration Risk | Investment Grade | Investment Grade Counterparty | Dominion Energy Gas Holdings, LLC |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 81.00% |
Customer Concentration Risk | Sales Revenue, Net | Dominion Energy Gas Holdings, LLC |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 98.00% |
Number of customers | Customer | 296 |
Customer Concentration Risk | Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Ten Largest Customers |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 38.00% |
Customer Concentration Risk | Sales Revenue, Net | Dominion Energy Gas Holdings, LLC | Thirty Largest Customers |  |
Concentration Risk And Guarantor Obligations [Line Items] |  |
Concentration risk, percentage (percentage) | 72.00% |

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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