XML 148 R122.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Long-Term Debt (Total Long Term Debt) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Total principal |  | $ 34,293 | $ 32,192
Fair value hedge valuation | [1] | (22) | (1)
Securities due within one year | [2],[3] | (3,078) | (1,709)
Unamortized discount and debt issuance costs |  | 245 | 251
Dominion Energy, Inc. total long-term debt |  | $ 30,948 | 30,231
Long Term Debt Due Within One Year [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [2],[3],[4] | 3.44% |
Senior Notes | Variable rates, due 2019 and 2020 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 1.99% |
Total principal |  | $ 800 |
Senior Notes | 1.25% to 6.4%, due 2017 to 2022 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 2.95% |
Total principal |  | $ 5,800 | 5,750
Senior Notes | 2.85% to 7.0%, due 2024 to 2044 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 4.72% |
Total principal |  | $ 5,049 | 4,649
Senior Notes | 6.8% and 6.875%, due 2026 and 2027 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 6.81% |
Dominion Energy, Inc. total long-term debt | [5] | $ 89 | 89
Senior Notes | 5.31% to 6.85%, due 2017 and 2018 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 5.72% |
Total principal | [6] | $ 120 | 135
Senior Notes | 2.98% to 7.20%, due 2024 to 2051 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 4.37% |
Total principal |  | $ 600 | 500
Term Loans | Tax-Exempt Financing, variable rate, due 2041 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal | [7] |  | 75
Term Loans | Term loan, variable rate, due 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal | [6] |  | 250
Term Loans | Term Loans, variable rates, due 2023 and 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4],[8] | 3.74% |
Total principal | [8] | $ 638 | 405
Term Loans | Tax-Exempt Financing, 1.55%, due 2033 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4],[9] | 1.55% |
Total principal | [9] | $ 27 | 27
Unsecured Junior Subordinated Notes | : 2.579% to 4.104%, due 2019 to 2021 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 3.08% |
Total principal |  | $ 2,100 | 1,100
Unsecured Junior Subordinated Notes | Payable to Affiliated Trust, 8.4% due 2031 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 8.40% |
Total principal |  | $ 10 | 10
Unsecured Junior Subordinated Notes | 5.25% and 5.75%, due 2054 and 2076 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 5.48% |
Total principal |  | $ 1,485 | 1,485
Unsecured Junior Subordinated Notes | Variable rates, due 2066 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 4.15% |
Total principal |  | $ 422 | 422
Remarketable Subordinated Notes | Remarketable Subordinated Notes, 1.5% and 2.0%, due 2020 to 2024 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 2.00% |
Total principal |  | $ 1,400 | 2,400
Dominion Energy Gas Holdings, LLC |  |  |
Debt Instrument [Line Items] |  |  |
Total principal |  | 3,600 | 3,563
Unamortized discount and debt issuance costs |  | (30) | (35)
Dominion Energy, Inc. total long-term debt |  | $ 3,570 | 3,528
Dominion Energy Gas Holdings, LLC | Senior Notes | 2.5% and 2.8%, due 2019 and 2020 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 2.68% |
Total principal |  | $ 1,150 | 1,150
Dominion Energy Gas Holdings, LLC | Senior Notes | 2.875% to 4.8%, due 2023 to 2044 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4],[10] | 3.90% |
Total principal | [10] | $ 2,450 | 2,413
Virginia Electric and Power Company |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 4.17% |
Total principal |  | $ 11,418 | 10,597
Securities due within one year |  | (850) | (678)
Unamortized discount and debt issuance costs |  | (72) | (67)
Dominion Energy, Inc. total long-term debt |  | $ 10,496 | 9,852
Virginia Electric and Power Company | Senior Notes | 1.2% to 7.25%, due 2017 to 2022 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 3.92% |
Total principal | [11],[12] | $ 1,950 | 2,554
Virginia Electric and Power Company | Senior Notes | 2.75% to 8.875%, due 2023 to 2047 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 4.53% |
Total principal |  | $ 8,690 | 7,190
Virginia Electric and Power Company | Term Loans | Variable rates, due 2017 to 2027 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 1.27% |
Total principal |  | $ 100 | 175
Virginia Electric and Power Company | Tax Exempt Financing [Member] | 1.75% to 5.6%, due 2023 to 2041 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 2.25% |
Total principal |  | $ 678 | 678
Dominion Energy Midstream Partners, LP |  |  |
Debt Instrument [Line Items] |  |  |
Securities due within one year |  | $ 250 |
Dominion Energy Midstream Partners, LP | Senior Notes | Unsecured Senior and Medium Term Notes, 5.83% and 6.48%, due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4],[9] | 5.84% |
Total principal | [13] | $ 255 | 255
Dominion Energy Midstream Partners, LP | Senior Notes | Unsecured Senior Note, 4.875%, due 2041 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4],[13] | 4.88% |
Total principal | [13] | $ 180 | 180
Dominion Energy Midstream Partners, LP | Term Loans | Term Loan, variable rate, due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
2017 Weighted- average Coupon (percentage) | [4] | 2.74% |
Total principal |  | $ 300 | $ 300
[1] | Represents the valuation of certain fair value hedges associated with Dominion Energy's fixed rate debt.
[2] | Excludes $250 million of Dominion Energy Questar Pipeline's senior notes that matured in February 2018 which were repaid using proceeds from the January 2018 issuance, through private placement, of $100 million of 3.53% senior notes and $150 million of 3.91% senior notes that mature in 2028 and 2038, respectively.
[3] | Includes $20 million of estimated mandatory prepayments due within one year based on estimated cash flows in excess of debt service at SBL Holdco and Dominion Solar Projects III, Inc.
[4] | Represents weighted-average coupon rates for debt outstanding as of December 31, 2017.
[5] | Represents debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[6] | Represents debt obligations of Dominion Energy Questar or Questar Gas. See Note 3 for more information.
[7] | Represents variable rate Massachusetts Development Finance Agency Solid Waste Disposal Revenue Bonds due in 2041 repaid in August 2017.
[8] | Represents debt associated with SBL Holdco and Dominion Solar Projects III, Inc. The debt is nonrecourse to Dominion Energy and is secured by SBL Holdco's and Dominion Solar Projects III, Inc.'s interest in certain merchant solar facilities.
[9] | Represents debt obligations of a DGI subsidiary.
[10] | Amount includes foreign currency remeasurement adjustments.
[11] | Annual interest rate applies to each of the Series A-1 RSNs and Series A-2 RSNs.
[12] | These financings relate to certain pollution control equipment at Virginia Power's generating facilities. As of December 31, 2017, certain variable rate tax-exempt financings are supported by a $100 million credit facility that terminates in April 2020. In February 2018, Virginia Power provided notice to redeem three series of variable rate tax-exempt financings with an aggregate outstanding principal of $100 million. The financings would otherwise mature in 2024, 2026 and 2027.
[13] | Represents debt obligations of Dominion Energy Questar Pipeline. See Note 3 for more information.

X
- Definition Longterm Debt Gross Current Maturities + References No definition available. + Details
Name: | d_LongtermDebtGrossCurrentMaturities
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
Name: | us-gaap_FairValueHedgesAtFairValueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_LongTermDebtDueWithinOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorNotesVariableRatesDueTwoThousandNineteenAndTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorNotesOnePointTwoFiveToSixPointFourPercentDueTwoThousandSeventeenToTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorNotesTwoPointEightFiveToSevenPointZeroPercentDueTwoThousandTwentyFourToTwoThousandFortyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_A68And6875Due2026And2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorAndMediumTermNotes531To685Due2017And2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorAndMediumTermNotes298To720Due2024To2051Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LoansPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UtilityTaxExemptLoanVariableRateDue2041Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_TermLoanVariableRateDue2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_TermLoansVariableRatesDueTwoThousandTwentyThreeAndTwoThousandTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UtilityTaxExemptLoan155Due2033Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_JuniorSubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredJuniorSubordinatedNotesTwoPointFiveSevenNineToFourPointOneZeroFourPercentDueTwoThousandNineteenToTwoThousandTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredJuniorSubordinatedNotesPayableToAffiliatedTrusts84PercentDue2031Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_EnhancedJuniorSubordinatedNotesFivePointTwoFiveToFivePointSevenFivePercentDueTwoThousandFiftyFourToTwoThousandSeventySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_EnhancedJuniorSubordinatedNotesVariableRateDue2066Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_RemarketableSubordinatedNotesOnePointFiveAndTwoPointZeroPercentDueTwoThousandTwentyToTwoThousandTwentyFourMember
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_DebtInstrumentAxis=d_UnsecuredSeniorNotesTwoPointFiveToTwoPointEightPercentDueTwoThousandNineteenToTwoThousandTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorNotes2875To48Due2023To2044Member
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: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorNotesOnePointTwoToSevenPointTwoFivePercentDueTwoThousandSeventeenToTwoThousandTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorNotesTwoPointSevenFiveToEightPointEightSevenFivePercentDueTwoThousandTwentyThreeToTwoThousandFortySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UtilityTaxExemptLoanVariableRateDue2017To2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=d_TaxExemptFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UtilityTaxExemptLoan175To56Due2023To2041Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorAndMediumTermNotes583To648Due2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_UnsecuredSeniorNote4875Due2041Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=d_TermLoanVariableRateDue2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |