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Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Details) | Mar. 31, 2017 USD ($)
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Line of Credit Facility [Line Items] |  |
Facility Limit | $ 5,500,000,000 |
Outstanding Commercial Paper | 2,627,000,000 |
Outstanding Letters of Credit | 76,000,000 |
Facility Capacity Available | 2,797,000,000 |
Virginia Electric and Power Company |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 5,500,000,000 | [1]
Outstanding Commercial Paper | 40,000,000 |
Outstanding Letters of Credit | 1,000,000 |
Dominion Gas Holdings, LLC |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 1,500,000,000 | [2]
Outstanding Commercial Paper | 399,000,000 |
Outstanding Letters of Credit | 0 |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Virginia Electric and Power Company |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 2,000,000,000.0 |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Dominion Gas Holdings, LLC |  |
Line of Credit Facility [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 | Dominion Gas Holdings, LLC |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 500,000,000 |
Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million | Letter of Credit |  |
Line of Credit Facility [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 | Virginia Electric and Power Company |  |
Line of Credit Facility [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 |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 1,500,000,000.0 |
Credit Facility 4 Billion |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 5,000,000,000 | [3]
Outstanding Commercial Paper | 2,627,000,000 | [3]
Outstanding Letters of Credit | 0 | [3]
Facility Capacity Available | 2,373,000,000 | [3]
Credit Facility 4 Billion | Virginia Electric and Power Company |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 5,000,000,000 | [1]
Outstanding Commercial Paper | 40,000,000 | [1]
Outstanding Letters of Credit | 0 | [1]
Credit Facility 4 Billion | Dominion Gas Holdings, LLC |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 1,000,000,000 | [2]
Outstanding Commercial Paper | 399,000,000 | [2]
Outstanding Letters of Credit | 0 | [2]
Credit Facility 500 Million |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 500,000,000 | [3]
Outstanding Commercial Paper | 0 | [3]
Outstanding Letters of Credit | 76,000,000 | [3]
Facility Capacity Available | 424,000,000 | [3]
Credit Facility 500 Million | Virginia Electric and Power Company |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 500,000,000 | [1]
Outstanding Commercial Paper | 0 | [1]
Outstanding Letters of Credit | 1,000,000 | [1]
Credit Facility 500 Million | Dominion Gas Holdings, LLC |  |
Line of Credit Facility [Line Items] |  |
Facility Limit | 500,000,000 | [2]
Outstanding Commercial Paper | 0 | [2]
Outstanding Letters of Credit | $ 0 | [2]
[1] | 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.
[2] | 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.
[3] | These credit facilities mature in April 2020 and can be used by the Companies 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.

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