XML 116 R95.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Related-Party Transactions (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  |  | $ 2,046 | $ 2,748
Virginia Electric and Power Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  |  | 1,170 | 1,216
Virginia Electric and Power Company | Services provided by affiliates | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures | $ 38 | $ 37 | 75 | 71
Dominion Energy Gas Holdings, LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures |  |  | 316 | 309
Dominion Energy Gas Holdings, LLC | Services provided by affiliates | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital expenditures | $ 7 | $ 12 | $ 17 | $ 20

X
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
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_RelatedPartyTransactionLineItems
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: | us-gaap_RelatedPartyTransactionAxis=d_ServicesProvidedByAffiliatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
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: |