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Short-Term Debt and Credit Agreements (Commercial Paper, Bank Loans, and Letters of Credit Outstanding, as well as Capacity Available Under Credit Facilities (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) facility | Nov. 30, 2016 USD ($) facility | Oct. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Dec. 31, 2015 USD ($)
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [1] |  | $ 5,500,000,000 |  |  |  |  | $ 4,500,000,000
Outstanding Commercial Paper | [2] |  | 3,155,000,000 |  |  |  |  | 3,509,000,000
Outstanding Letters of Credit |  |  | 85,000,000 |  |  |  |  | 59,000,000
Facility Capacity Available |  |  | $ 2,260,000,000 |  |  |  |  | 932,000,000
Weighted-average percentage interest rates | [3],[4] |  | 3.13% |  |  |  |  |
Amounts outstanding under facilities |  |  | $ 3,155,000,000 |  |  |  |  | 3,509,000,000
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [5] |  | 5,500,000,000 |  |  |  |  | 4,500,000,000
Outstanding Commercial Paper | [6] |  | 65,000,000 |  |  |  |  | 1,656,000,000
Outstanding Letters of Credit |  |  | $ 1,000,000 |  |  |  |  | 0
Weighted-average percentage interest rates | [4] |  | 5.47% |  |  |  |  |
Number of joint revolving credit facilities | facility |  |  | 2 |  |  |  |  |
Amounts outstanding under facilities |  |  | $ 65,000,000 |  |  |  |  | 1,656,000,000
Credit facility |  |  | 100,000,000 |  |  | $ 100,000,000 | $ 120,000,000 |
Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [7] |  | 1,500,000,000 |  |  |  |  | 1,500,000,000
Outstanding Commercial Paper | [8] |  | 460,000,000 |  |  |  |  | 391,000,000
Outstanding Letters of Credit |  |  | $ 0 |  |  |  |  | 0
Number of joint revolving credit facilities | facility |  |  | 2 |  |  |  |  |
Amounts outstanding under facilities |  |  | $ 460,000,000 |  |  |  |  | 391,000,000
Revolving Credit Facility |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Increase in revolving credit facility limits |  | $ 1,000,000,000 |  |  |  |  |  |
Line of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Credit facility, to support letters of credit |  |  | 100,000,000 |  |  |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Dominion Questar Corporation |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Number of joint revolving credit facilities | facility |  |  |  |  | 2 |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Credit facility, to support letters of credit |  |  | 2,000,000,000.0 |  |  |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  | $ 1,500,000,000.0
Credit facility, to support letters of credit |  |  |  |  |  | 750,000,000 |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Questar Gas |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 250,000,000 |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Letter of Credit |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Credit facility, to support letters of credit |  |  | 2,000,000,000.0 |  |  |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  |  | 2,000,000,000.0 |  |  |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Letter of Credit | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  |  | 1,500,000,000.0 |  |  |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Line of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  | 5,000,000,000 | $ 4,000,000,000 |  |  |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Line of Credit | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Credit facility, to support letters of credit |  |  |  |  | $ 500,000,000 |  |  |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Commercial Paper |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  | 1.05% |  |  |  |  | 0.62%
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Commercial Paper | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  | 0.97% |  |  |  |  | 0.60%
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Commercial Paper | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  | 1.00% |  |  |  |  | 0.63%
Credit Facility 5 Billion |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [1],[9] | $ 5,000,000,000.0 | $ 5,000,000,000 |  |  |  |  | $ 4,000,000,000
Outstanding Commercial Paper | [1] |  | 3,155,000,000 | [9] |  |  |  | 3,353,000,000
Outstanding Letters of Credit | [1] |  | 0 | [9] |  |  |  | 0
Facility Capacity Available | [1] |  | 1,845,000,000 | [9] |  |  |  | 647,000,000
Credit Facility 5 Billion | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [5] |  | 5,000,000,000 | [10] |  |  |  | 4,000,000,000
Outstanding Commercial Paper | [5] |  | 65,000,000 | [10] |  |  |  | 1,500,000,000
Outstanding Letters of Credit | [5] |  | 0 | [10] |  |  |  | 0
Credit Facility 5 Billion | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [7] |  | 1,000,000,000 |  |  |  |  | 1,000,000,000
Outstanding Commercial Paper | [7] |  | 460,000,000 |  |  |  |  | 391,000,000
Outstanding Letters of Credit | [7] |  | 0 |  |  |  |  | 0
Credit Facility 500 million |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [1] |  | 500,000,000 |  |  |  |  | 500,000,000
Outstanding Commercial Paper | [1] |  | 0 |  |  |  |  | 156,000,000
Outstanding Letters of Credit | [1] |  | 85,000,000 |  |  |  |  | 59,000,000
Facility Capacity Available | [1] |  | 415,000,000 |  |  |  |  | 285,000,000
Credit Facility 500 million | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [5] |  | 500,000,000 |  |  |  |  | 500,000,000
Outstanding Commercial Paper | [5] |  | 0 |  |  |  |  | 156,000,000
Outstanding Letters of Credit | [5] |  | 1,000,000 |  |  |  |  | 0
Credit Facility 500 million | Dominion Gas Holdings, LLC |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit | [7] |  | 500,000,000 |  |  |  |  | 500,000,000
Outstanding Commercial Paper | [7] |  | 0 |  |  |  |  | 0
Outstanding Letters of Credit | [7] |  | 0 |  |  |  |  | $ 0
Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | SBL Holdco |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 30,000,000 |  |  |  |  |
Duration of credit facilities |  |  | 1 year |  |  |  |  |
Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | Line of Credit | SBL Holdco |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Amounts outstanding under facilities |  |  | $ 0 |  |  |  |  |
Tax-Exempt Financings | Virginia Electric and Power Company |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Variable rate tax-exempt financings |  |  | $ 100,000,000 |  |  |  |  |
Revolving 364-day Credit Facility | Dominion Questar Corporation |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | 250,000,000 |  |
Duration of credit facilities |  |  | 364 days |  |  |  |  |
Revolving Multi-year Credit Facility | Dominion Questar Corporation |  |  |  |  |  |  |  |
Short term Debt [Line Items] |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 500,000,000 |  |
[1] | In May 2016, the maturity dates for these facilities were extended from April 2019 to April 2020. These credit facilities can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2] | The weighted-average interest rates of the outstanding commercial paper supported by Dominion’s credit facilities were 1.05% and 0.62% at December 31, 2016 and 2015, respectively.
[3] | 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.
[4] | Represents weighted-average coupon rates for debt outstanding as of December 31, 2016.
[5] | The full amount of the facilities is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion, Dominion Gas and Questar Gas. Sub-limits for Virginia Power are set within the facility limit but can be changed at the option of Dominion, Dominion Gas and Questar Gas multiple times per year. At December 31, 2016, the sub-limit for Virginia Power was an aggregate $2.0 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion. In May 2016, the maturity dates for these facilities were extended from April 2019 to April 2020. These credit facilities can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[6] | The weighted-average interest rates of the outstanding commercial paper supported by these credit facilities were 0.97% and 0.60% at December 31, 2016 and 2015, respectively.
[7] | A maximum of a combined $1.5 billion of the facilities is available to Dominion Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion, Virginia Power and Questar Gas. Sub-limits for Dominion Gas are set within the facility limit but can be changed at the option of the Companies multiple times per year. In November 2016, the aggregate sub-limit for Dominion Gas was decreased from $750 million to $500 million. If Dominion Gas has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion. In May 2016, the maturity dates for these facilities were extended from April 2019 to April 2020. These credit facilities can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.
[8] | The weighted-average interest rate of the outstanding commercial paper supported by these credit facilities was 1.00% and 0.63% at December 31, 2016 and 2015, respectively.
[9] | In January 2016, this facility limit was increased from $4.0 billion to $5.0 billion.
[10] | In January 2016, this facility limit was increased from $4.0 billion to $5.0 billion.

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