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Significant Financing Transactions (Narrative) (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) facility | Jan. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Facility Limit |  | $ 5,500,000,000 |  |  |
Short-term debt |  | 2,627,000,000 |  | $ 3,155,000,000 | [1]
Senior Notes, Due in 2019 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total Long-term Debt |  |  | $ 400,000,000 |  |
Interest rate percentage |  |  | 1.875% |  |
Senior Notes, Due in 2022 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total Long-term Debt |  |  | $ 400,000,000 |  |
Interest rate percentage |  |  | 2.75% |  |
Senior Notes, Due in 2024 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total Long-term Debt |  | $ 300,000,000 |  |  |
Interest rate percentage |  | 3.496% |  |  |
Senior Notes, Due in 2025 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total Long-term Debt |  | $ 100,000,000 |  |  |
Interest rate percentage |  | 3.90% |  |  |
Senior Notes, Due in 2027 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total Long-term Debt |  | $ 750,000,000 |  |  |
Interest rate percentage |  | 3.50% |  |  |
Questar Gas | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of joint revolving credit facilities | facility |  | 2 |  |  |
Facility Limit |  | $ 250,000,000 |  |  |
SBL Holdco | Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Facility Limit |  | $ 30,000,000 |  |  |
Automatic renewal period |  | 1 year |  |  |
SBL Holdco | Line of Credit | Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt |  | $ 0 |  |  |
Virginia Electric and Power Company |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of joint revolving credit facilities | facility |  | 2 |  |  |
Facility Limit | [2] | $ 5,500,000,000 |  |  |
Short-term debt |  | 40,000,000 |  | 65,000,000 | [3]
Credit facility |  | 100,000,000 |  |  |
Virginia Electric and Power Company | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Facility Limit |  | 2,000,000,000.0 |  |  |
Virginia Electric and Power Company | Tax Exempt Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate tax-exempt financings |  | $ 100,000,000 |  |  |
Dominion Gas Holdings, LLC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of joint revolving credit facilities | facility |  | 2 |  |  |
Facility Limit | [4] | $ 1,500,000,000 |  |  |
Short-term debt |  | 399,000,000 |  | $ 460,000,000 | [5]
Dominion Gas Holdings, LLC | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Facility Limit |  | 1,500,000,000.0 |  |  |
Dominion Gas Holdings, LLC | Line of Credit | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Facility Limit |  | $ 500,000,000 |  |  |
[1] | Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | 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 the Companies multiple times per year. At March 31, 2017, the aggregate sub-limit for Virginia Power was $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. These credit facilities mature in April 2020 and 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.
[3] | Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | 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. At March 31, 2017, the aggregate sub-limit for Dominion Gas was $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. These credit facilities mature in April 2020 and 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.
[5] | Dominion Gas’ Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.

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