XML 96 R73.htm IDEA: XBRL DOCUMENT
v3.20.4

Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  |  | $ 2,105 |  | $ 1,520 |  | $ 12
Asset retirement obligations |  |  | 5,583 | [1] | 5,184 | [1] | 2,444
Gains on sales of assets |  |  | $ 61 |  | $ 152 |  | 265
GT&S Transaction |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [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 |  |  |  |  |  |  | 165
Charge for disallowance of FERC-regulated plant |  |  |  |  |  |  | 127
After-tax charge for disallowance of FERC-regulated plant |  |  |  |  |  |  | 92
Loss associated with cash flow hedges of debt-related items | $ 237 |  |  |  |  |  |
Loss associated with cash flow hedges of debt-related items after tax | $ 178 |  |  |  |  |  |
GT&S Transaction | Marcellus Shale and Utica and Point Pleasant Shale |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gains on sales of assets |  |  |  |  |  |  | 115
Gains on sales of assets after tax |  |  |  |  |  |  | 83
GT&S Transaction | FERC-regulated |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  | 37
Asset impairment charges after tax |  |  |  |  |  |  | $ 28
Supply Header Project | GT&S Transaction |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Impairment of assets and other charges |  | $ 482 |  |  |  |  |
Asset impairment charges after tax |  | 359 |  |  |  |  |
Atlantic Coast Pipeline Project | GT&S Transaction |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Asset retirement obligations |  | $ 75 |  |  |  |  |
[1] | Includes $394 million and $179 million reported in other current liabilities at December 31, 2019 and 2020, respectively.

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 Asset Impairment Charges After Tax + References No definition available. + Details
Name: | d_AssetImpairmentChargesAfterTax
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 Gain loss on disposition of assets after tax. + References No definition available. + Details
Name: | d_GainLossOnDispositionOfAssetsAfterTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 Loss associated with cash flow hedges of debt-related items. + References No definition available. + Details
Name: | d_LossAssociatedWithCashFlowHedgesOfDebtRelatedItems
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loss associated with cash flow hedges of debt related items after tax. + References No definition available. + Details
Name: | d_LossAssociatedWithCashFlowHedgesOfDebtRelatedItemsAfterTax
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: 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=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_EnergyAxis=d_MarcellusShaleAndUticaAndPointPleasantShaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_SupplyHeaderProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=d_AtlanticCoastPipelineProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |