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Long-Term Debt (Total Long Term Debt) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [1],[2] | 3.13% |
Total principal |  | $ 32,192,000,000 | $ 25,473,000,000
Securities due within one year | [1] | (1,709,000,000) | (1,825,000,000)
Unamortized discount and debt issuance costs |  | (251,000,000) | (187,000,000)
Total long term debt |  | 30,231,000,000 | 23,468,000,000
Fair value hedge valuation, liability | [3] | (1,000,000) |
Fair value hedge valuation, asset | [3] |  | 7,000,000
Variable Rate Short Term Notes Maturing in May 2016 | Promissory note |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount of notes |  |  | 100,000,000
Senior Notes | Variable rate, due 2016 |  |  |
Debt Instrument [Line Items] |  |  |
Total principal |  | $ 0 | 600,000,000
Senior Notes | 1.25% to 6.4%, due 2016 to 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 1.25% |
Interest rate, maximum (percentage) |  | 6.40% |
2016 Weighted- average Coupon (percentage) | [2] | 2.83% |
Total principal |  | $ 5,400,000,000 | 3,900,000,000
Senior Notes | 2.75% to 7.0%, due 2022 to 2044 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 2.75% |
Interest rate, maximum (percentage) |  | 7.00% |
2016 Weighted- average Coupon (percentage) | [2] | 4.68% |
Total principal |  | $ 4,999,000,000 | 4,599,000,000
Senior Notes | 6.8% and 6.875%, due 2026 and 2027(4) |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 6.80% |
Interest rate, maximum (percentage) |  | 6.875% |
2016 Weighted- average Coupon (percentage) | [2],[4] | 6.81% |
Total principal | [4] | $ 89,000,000 | 89,000,000
Senior Notes | 5.31% to 6.85%, due 2017 and 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 5.31% |
Interest rate, maximum (percentage) |  | 6.85% |
2016 Weighted- average Coupon (percentage) | [2],[5] | 5.84% |
Total principal | [5] | $ 135,000,000 | 0
Senior Notes | 2.98% to 7.20%, due 2024 to 2051 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 2.98% |
Interest rate, maximum (percentage) |  | 7.20% |
2016 Weighted- average Coupon (percentage) | [2],[5] | 4.57% |
Total principal | [5] | $ 500,000,000 | 0
Junior Subordinated Notes | 2.962% and 4.104%, due 2019 and 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 2.962% |
Interest rate, maximum (percentage) |  | 4.104% |
2016 Weighted- average Coupon (percentage) | [2] | 3.53% |
Total principal |  | $ 1,100,000,000 | 0
Junior Subordinated Notes | Payable to Affiliated Trust, 8.4% due 2031 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2] | 8.40% |
Interest rate (percentage) |  | 8.40% |
Total principal |  | $ 10,000,000 | 10,000,000
Junior Subordinated Notes | 5.25% to 7.5%, due 2054 to 2076 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 5.25% |
Interest rate, maximum (percentage) |  | 7.50% |
2016 Weighted- average Coupon (percentage) | [2] | 5.48% |
Total principal |  | $ 1,485,000,000 | 971,000,000
Junior Subordinated Notes | Variable rates, due 2066 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2] | 3.45% |
Total principal |  | $ 422,000,000 | 377,000,000
Term Loans | Tax-Exempt Financing, variable rate, due 2041 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2] | 1.41% |
Total principal |  | $ 75,000,000 | 75,000,000
Term Loans | Term loan, variable rate, due 2017 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2],[4],[5] | 1.85% |
Total principal | [4],[5] | $ 250,000,000 | 0
Term Loans | Term Loan, variable rate, due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2],[6] | 4.75% |
Total principal | [6] | $ 405,000,000 | 0
Term Loans | Tax-Exempt Financing, 1.55%, due 2033 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2],[7] | 1.55% |
Interest rate (percentage) |  | 1.55% |
Total principal | [7] | $ 27,000,000 | 27,000,000
Remarketable Subordinated Notes | Remarketable Subordinated Notes, 1.07% to 2.0%, due 2019 to 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 1.07% |
Interest rate, maximum (percentage) |  | 2.00% |
2016 Weighted- average Coupon (percentage) | [2] | 1.79% |
Total principal |  | $ 2,400,000,000 | 2,100,000,000
Dominion Gas Holdings, LLC |  |  |
Debt Instrument [Line Items] |  |  |
Total principal |  | 3,563,000,000 | 3,300,000,000
Securities due within one year |  | 0 | (400,000,000)
Unamortized discount and debt issuance costs |  | (35,000,000) | (31,000,000)
Total long term debt |  | $ 3,528,000,000 | 2,869,000,000
Dominion Gas Holdings, LLC | Senior Notes | 1.05% to 2.8%, due 2016 to 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 1.05% |
Interest rate, maximum (percentage) |  | 2.80% |
2016 Weighted- average Coupon (percentage) | [2] | 2.68% |
Total principal |  | $ 1,150,000,000 | 1,550,000,000
Dominion Gas Holdings, LLC | Senior Notes | 2.875% to 4.8%, due 2023 to 2044 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 2.875% |
Interest rate, maximum (percentage) |  | 4.80% |
2016 Weighted- average Coupon (percentage) | [2],[8] | 3.90% |
Total principal | [8] | $ 2,413,000,000 | 1,750,000,000
Virginia Electric and Power Company |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2] | 5.47% |
Total principal |  | $ 10,597,000,000 | 9,425,000,000
Securities due within one year |  | (678,000,000) | (476,000,000)
Unamortized discount and debt issuance costs |  | (67,000,000) | (57,000,000)
Total long term debt |  | 9,852,000,000 | 8,892,000,000
Virginia Electric and Power Company | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, to support letters of credit |  | $ 100,000,000 |
Virginia Electric and Power Company | Senior Notes | 1.2% to 8.625%, due 2016 to 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 1.20% |
Interest rate, maximum (percentage) |  | 8.625% |
2016 Weighted- average Coupon (percentage) | [2] | 4.93% |
Total principal |  | $ 1,804,000,000 | 2,261,000,000
Virginia Electric and Power Company | Senior Notes | 2.75% to 8.875%, due 2022 to 2046 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 2.75% |
Interest rate, maximum (percentage) |  | 8.875% |
2016 Weighted- average Coupon (percentage) | [2] | 4.59% |
Total principal |  | $ 7,940,000,000 | 6,292,000,000
Virginia Electric and Power Company | Term Loans | Variable rates, due 2016 to 2027 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2],[9] | 1.22% |
Total principal | [9] | $ 175,000,000 | 194,000,000
Virginia Electric and Power Company | Term Loans | 1.75% to 5.6%, due 2023 to 2041 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 1.75% |
Interest rate, maximum (percentage) |  | 5.60% |
2016 Weighted- average Coupon (percentage) | [2],[9] | 2.25% |
Total principal | [9] | $ 678,000,000 | 678,000,000
Dominion Midstream Partners, LP | Senior Notes | Unsecured Senior and Medium Term Notes, 5.83% and 6.48%, due 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, minimum (percentage) |  | 5.83% |
Interest rate, maximum (percentage) |  | 6.48% |
2016 Weighted- average Coupon (percentage) | [2],[10] | 5.84% |
Total principal | [10] | $ 255,000,000 | 0
Dominion Midstream Partners, LP | Senior Notes | Unsecured Senior Note, 4.875%, due 2041 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2],[10] | 4.88% |
Interest rate (percentage) |  | 4.875% |
Total principal | [10] | $ 180,000,000 | 0
Dominion Midstream Partners, LP | Term Loans | Term Loan, variable rate, due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
2016 Weighted- average Coupon (percentage) | [2] | 2.19% |
Total principal |  | $ 300,000,000 | $ 0
[1] | 2015 excludes $100 million of variable rate short-term notes that were purchased and cancelled in February 2016 using proceeds from the issuance of long-term debt. The notes would have otherwise matured in May 2016.
[2] | Represents weighted-average coupon rates for debt outstanding as of December 31, 2016.
[3] | Represents the valuation of certain fair value hedges associated with Dominion's fixed rate debt.
[4] | Represents debt assumed by Dominion from the merger of its former CNG subsidiary.
[5] | Represents debt obligations of Dominion Questar or Dominion Gas. See Note 3 for more information.
[6] | Represents debt associated with SBL Holdco. The debt is nonrecourse to Dominion and is secured by SBL Holdco's interest in certain merchant solar facilities.
[7] | Represents debt obligations of a DEI subsidiary.
[8] | Beginning June 30, 2016, amount includes foreign currency remeasurement adjustments.
[9] | These financings relate to certain pollution control equipment at Virginia Power's generating facilities. Certain variable rate tax-exempt financings are supported by a $100 million credit facility that terminates in April 2020.
[10] | Represents debt obligations of Questar Pipeline. See Note 3 for more information.

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