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Fair Value Measurements (Net Change in the Assets and Liabilities Measured at Fair Value on a Recurring Basis and Included in the Level 3 Fair Value Category) (Detail) - Commodity - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Beginning balance | $ 150 | $ 139 | $ 95
Total realized and unrealized gains (losses): |  |  |
Included in other comprehensive income (loss) | 1 | (2) |
Included in regulatory assets/liabilities | (44) | 42 | (39)
Settlements | (27) | 6 | 38
Purchases |  |  | 87
Transfers out of Level 3 | 1 | 3 | (7)
Ending balance | 64 | 150 | 139
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at the reporting date |  | 2 | (1)
Virginia Electric and Power Company |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Beginning balance | 147 | 143 | 93
Total realized and unrealized gains (losses): |  |  |
Included in regulatory assets/liabilities | (45) | 40 | (37)
Settlements | (25) | 7 | 35
Purchases |  |  | 87
Ending balance | 60 | 147 | 143
Dominion Energy Gas Holdings, LLC |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Beginning balance | (2) | (2) | 6
Total realized and unrealized gains (losses): |  |  |
Included in other comprehensive income (loss) | 1 | (3) |
Transfers out of Level 3 | 1 | 3 | (8)
Ending balance |  | (2) | (2)
Operating Revenue |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings | (2) | 3 |
Electric fuel and other energy-related purchases |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings | (15) | (42) | (35)
Electric fuel and other energy-related purchases | Virginia Electric and Power Company |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings | $ (17) | (43) | $ (35)
Purchased Gas |  |  |
Total realized and unrealized gains (losses): |  |  |
Included in earnings |  | $ 1 |

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- Definition Fair value, net derivative asset (liability) measured on recurring basis, unobservable inputs reconciliation, gain (loss) included in regulatory assets and liabilities. + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liabilities Total Gains Losses Realized Unrealized [Abstract] + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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