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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.

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