XML 201 R179.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Operating Segments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
After-tax charge related to the impairment of gathering and processing assets | $ 164 |  |  |  |  |
Net loss related to investments in nuclear decommissioning trust funds, after tax |  |  |  | $ (17) | $ 141 | $ (325)
Charge for disallowance of FERC-regulated plant, after tax |  | $ 89 |  |  |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  | 81 |  | 197
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  | $ (851) | 46 | (851) | 0
Charges associated with equity method investments in wind-powered generation facilities |  |  |  |  | 158 |
Charges associated with equity method investments in wind-powered generation facilities, after tax |  |  |  |  | 96 |
Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net loss related to investments in nuclear decommissioning trust funds, after tax |  |  |  | 2 | 16 | 6
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  | 81 |  | 197
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  | (93) | 21 | (93) | 0
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net loss related to investments in nuclear decommissioning trust funds, after tax |  |  |  | (45) | 25 | (24)
Charge for disallowance of FERC-regulated plant, after tax |  | $ 89 |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  | $ (197) | (11) | (197) | 0
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After-tax net (expenses) benefit |  |  |  | 88 | 861 | (180)
Benefit associated with sale of certain merchant generation facilities and equity method investments |  |  |  | 828 |  |
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax |  |  |  | 619 |  |
Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | (93) |
Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After-tax net (expenses) benefit |  |  |  | (244) | (174) | (7)
Charge related to impairment of certain gathering and processing assets |  |  |  | 219 |  |
After-tax charge related to the impairment of gathering and processing assets |  |  |  | 165 |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | 185 |
Charge for disallowance of FERC-regulated plant |  |  |  | 124 |  |
After-tax charge for disallowance of FERC-regulated plant |  |  |  | 88 |  |
Operating Segments | Organizational Design Initiative |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Organizational design initiative |  |  |  |  |  | 59
Organizational design initiative charges, after tax |  |  |  |  |  | 36
Operating Segments | Organizational Design Initiative | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Organizational design initiative |  |  |  |  |  | 8
Organizational design initiative charges, after tax |  |  |  |  |  | 5
Operating Segments | Virginia Legislation [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
One-time rate credit amount |  |  |  | 215 |  |
One-time rate credit amount after tax |  |  |  | 160 |  |
Operating Segments | Corporate and Other |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After-tax net (expenses) benefit |  |  |  | 608 | 389 | (484)
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After-tax net (expenses) benefit |  |  |  | (312) | 74 | (173)
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After-tax net (expenses) benefit |  |  |  | (251) | (179) | (3)
Operating Segments | Gas Infrastructure |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge related to impairment of certain gathering and processing assets |  |  |  | 219 |  |
After-tax charge related to the impairment of gathering and processing assets |  |  |  | 164 |  |
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax |  |  |  | 390 |  |
Operating Segments | Gas Infrastructure | FERC-Regulated Plant |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge for disallowance of FERC-regulated plant |  |  |  | 124 |  |
Charge for disallowance of FERC-regulated plant, after tax |  |  |  | 88 |  |
Operating Segments | Gas Infrastructure | Organizational Design Initiative |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  |  |  | 12
Operating Segments | Power Generation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net loss related to investments in nuclear decommissioning trust funds |  |  |  | (170) |  |
Net loss related to investments in nuclear decommissioning trust funds, after tax |  |  |  | (134) |  |
Charges associated with equity method investments in wind-powered generation facilities |  |  |  |  | 158 |
Charges associated with equity method investments in wind-powered generation facilities, after tax |  |  |  |  | 96 |
Operating Segments | Power Generation | Organizational Design Initiative |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  |  |  | 19
Operating Segments | Power Generation | Virginia Legislation [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge associated with one-time rate credits of certain amounts to utility customers, after tax |  |  |  | 109 |  |
Operating Segments | Power Generation | Virginia Regulation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  | 81 |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities, after tax |  |  |  | 60 |  |
Operating Segments | Power Generation | Facilities Subject to Coal Combustion Residual Final Rule |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  |  |  | 197
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities, after tax |  |  |  |  |  | 122
Operating Segments | Power Generation | Facilities Subject to Coal Combustion Residual Final Rule | Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  |  |  | 197
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities, after tax |  |  |  |  |  | 121
Operating Segments | Power Delivery |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge associated with major storm damage and service restoration |  |  |  | 70 |  |
Charge associated with major storm damage and service restoration, after tax |  |  |  | 52 |  |
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax |  |  |  | 229 |  |
Operating Segments | Power Delivery | Organizational Design Initiative |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Organizational design initiative charges, after tax |  |  |  |  |  | $ 5
Operating Segments | Power Delivery | Virginia Legislation [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge associated with one-time rate credits of certain amounts to utility customers, after tax |  |  |  | $ 51 |  |
Operating Segments | Remeasured Subsequent To Initial Recognition [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | (979) |
Operating Segments | Remeasured Subsequent To Initial Recognition [Member] | Gas Infrastructure |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | (324) |
Operating Segments | Remeasured Subsequent To Initial Recognition [Member] | Power Generation |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | $ (655) |

X
- Definition After-taxcharge for disallowance of FERC regulated plant + References No definition available. + Details
Name: | d_AfterTaxChargeForDisallowanceOfFERCRegulatedPlant
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition After-tax impairment charge for certain gathering and processing assets + References No definition available. + Details
Name: | d_AftertaxImpairmentChargeForCertainGatheringAndProcessingAssets
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Benefit Associated With Sale of Certain Merchant Generation Facilities and Equity Method Investments + References No definition available. + Details
Name: | d_BenefitAssociatedWithSaleOfCertainMerchantGenerationFacilitiesAndEquityMethodInvestments
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Benefit Associated With Sale of Certain Merchant Generation Facilities and Equity Method Investments After Tax + References No definition available. + Details
Name: | d_BenefitAssociatedWithSaleOfCertainMerchantGenerationFacilitiesAndEquityMethodInvestmentsAfterTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Charge for disallowance of FERC regulated plant + References No definition available. + Details
Name: | d_ChargeForDisallowanceOfFERCRegulatedPlant
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Charge related to disallowance of Ferc regulated plant. + References No definition available. + Details
Name: | d_ChargeRelatedToDisallowanceOfFercRegulatedPlant
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Charge related to disallowance of ferc regulated plant net of tax. + References No definition available. + Details
Name: | d_ChargeRelatedToDisallowanceOfFercRegulatedPlantNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Environmental remediation expense, net of tax. + References No definition available. + Details
Name: | d_EnvironmentalRemediationExpenseNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Equity method investments charges. + References No definition available. + Details
Name: | d_EquityMethodInvestmentsCharges
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Equity method investments charges net of tax. + References No definition available. + Details
Name: | d_EquityMethodInvestmentsChargesNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Impairment charge for certain gathering and processing assets + References No definition available. + Details
Name: | d_ImpairmentChargeForCertainGatheringAndProcessingAssets
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Major storm damage and service restoration charge. + References No definition available. + Details
Name: | d_MajorStormDamageAndServiceRestorationCharge
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Major storm damage and service restoration charge net of tax. + References No definition available. + Details
Name: | d_MajorStormDamageAndServiceRestorationChargeNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition One time Rate Credits To Customers + References No definition available. + Details
Name: | d_OneTimeRateCreditsToCustomers
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition One time Rate Credits To Customers after tax + References No definition available. + Details
Name: | d_OneTimeRateCreditsToCustomersAfterTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Restructuring charges, net of tax. + References No definition available. + Details
Name: | d_RestructuringChargesNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit). + References No definition available. + Details
Name: | d_TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax cuts and jobs act of 2017 one time reclass of stranded tax effects resulting from revaluation of DTA due to change in federal tax rate net of tax. + References No definition available. + Details
Name: | d_TaxCutsAndJobsActOf2017OneTimeReclassOfStrandedTaxEffectsResultingFromRevaluationOfDtaDueToChangeInFederalTaxRateNetOfTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
Name: | us-gaap_EnvironmentalRemediationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_NonoperatingIncomeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33775-111570 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_DominionEnergyGasHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=d_OrganizationalDesignInitiativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_VirginiaLegislationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=d_GasInfrastructureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=d_FercRegulatedPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=d_PowerGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=d_VirginiaRegulationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=d_FacilitiesSubjectToCoalCombustionResidualFinalRuleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=d_PowerDeliveryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=d_RemeasuredSubsequentToInitialRecognitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |