XML 112 R91.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies (Guarantees, Surety Bonds and Letters of Credit) (Detail) - USD ($) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2017 | Jun. 30, 2018
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure | [1] |  | $ 5,455,000,000
Commodity Transactions |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure | [2] |  | 2,142,000,000
Nuclear Obligations |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure | [3] |  | 200,000,000
Cove Point |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure | [4] |  | 1,900,000,000
Financial Guarantee [Member] | Equity Method Investee [Member] |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure |  |  | 48,000,000
Financial Guarantee [Member] | Affiliated Entity |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure |  |  | 10,000,000
Financial Guarantee [Member] | Affiliated Entity | Minimum |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum annual future contributions |  |  | 4,000,000
Financial Guarantee [Member] | Affiliated Entity | Maximum |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum annual future contributions |  |  | 6,000,000
Financial Guarantee [Member] | Atlantic Coast Pipeline | Revolving Credit Facility |  |  |
Guarantee Obligations [Line Items] |  |  |
Facility Limit |  | $ 3,400,000,000 |
Revolving credit facility stated maturity date |  | Oct. 31, 2021 |
Maximum potential loss exposure, limited guarantee percentage |  | 48.00% |
Guarantee liability |  |  | 30,000,000
Guarantee recorded amount |  |  | 877,000,000
Solar |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure | [5] |  | 636,000,000
Other |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure | [6] |  | 577,000,000
Surety Bond [Member] |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure |  |  | 165,000,000
Surety Bond [Member] | Virginia Electric and Power Company |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure |  |  | 70,000,000
Surety Bond [Member] | Dominion Energy Gas Holdings, LLC |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure |  |  | 24,000,000
Financial Standby Letter of Credit [Member] |  |  |
Guarantee Obligations [Line Items] |  |  |
Maximum Exposure |  |  | $ 72,000,000
[1] | Excludes Dominion Energy's guarantee for the construction of a new corporate office property as discussed in Note 22 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2017, as updated in Current Report on Form 8-K, filed June 6, 2018.
[2] | Guarantees related to commodity commitments of certain subsidiaries. These guarantees were provided to counterparties in order to facilitate physical and financial transaction-related commodities and services.
[3] | Guarantees related to certain DGI subsidiaries regarding all aspects of running a nuclear facility.
[4] | Guarantees related to Cove Point, in support of terminal services, transportation and construction.
[5] | Includes guarantees to facilitate the development of solar projects. Also includes guarantees entered into by DGI on behalf of certain subsidiaries to facilitate the acquisition and development of solar projects.
[6] | Guarantees related to other miscellaneous contractual obligations such as leases, environmental obligations, construction projects and insurance programs. Due to the uncertainty of workers’ compensation claims, the parental guarantee has no stated limit. Also included are guarantees related to certain DGI subsidiaries’ obligations for equity capital contributions and energy generation associated with Fowler Ridge and NedPower. As of June 30, 2018, Dominion Energy's maximum remaining cumulative exposure under these equity funding agreements is $10 million through 2019 and its maximum annual future contributions could range from approximately $4 million to $6 million.

X
- Definition Guarantee obligation. + References No definition available. + Details
Name: | d_GuaranteeObligation
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Guarantee obligations maximum potential loss exposure guarantee limited percentage. + References No definition available. + Details
Name: | d_GuaranteeObligationsMaximumPotentialLossExposureGuaranteeLimitedPercentage
Namespace Prefix: | d_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Guarantor obligations, future annual payments of distributions to affiliates. + References No definition available. + Details
Name: | d_GuarantorObligationsFutureAnnualPaymentsOfDistributionsToAffiliates
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line of credit facility maturity date. + References No definition available. + Details
Name: | d_LineOfCreditFacilityMaturityDate
Namespace Prefix: | d_
Data Type: | xbrli:dateItemType
Balance Type: | na
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_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_TradingActivityByTypeAxis=us-gaap_CommodityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_NuclearPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_EquityMethodInvesteeMember
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: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=d_AtlanticCoastPipelineLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=d_SolarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=d_OtherGuarantorObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_SuretyBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: | us-gaap_GuaranteeObligationsByNatureAxis=us-gaap_FinancialStandbyLetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |