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Significant Financing Transactions (Narrative) (Detail) | 1 Months Ended | 2 Months Ended | 3 Months Ended |  |
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Apr. 30, 2018 USD ($) $ / shares | Mar. 31, 2018 USD ($) facility | Feb. 28, 2018 USD ($) agreement | Jan. 31, 2018 USD ($) shares | Jun. 30, 2017 USD ($) agreement | Apr. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) facility shares | Mar. 31, 2017 USD ($) shares | May 03, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of joint revolving credit facilities | facility |  |  | 2 |  |  |  |  | 2 |  |  |  |
Short-term debt |  |  | $ 2,713,000,000 |  |  |  |  | $ 2,713,000,000 |  |  | $ 3,298,000,000 | [1]
Issuance of common stock |  |  |  |  |  |  |  | 580,000,000 | $ 79,000,000 |  |  |
Aggregate proceeds from issuance of shares of common stock |  |  |  |  |  |  |  | $ 581,000,000 | $ 79,000,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  | 8,000,000 | 1,000,000 |  |  |
Issuance of common stock |  |  |  |  |  |  |  | $ 580,000,000 | $ 79,000,000 |  |  |
Shelf Registration For Sale Of Common Stock Through At Market Program |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of sales agency agreements | agreement |  |  |  | 6 |  | 3 |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  | 6,600,000 |  |  |  |  |  |  |
Issuance of common stock |  |  |  | $ 0 | $ 495,000,000 |  |  |  |  |  |  |
Fees and commissions paid |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Shelf Registration For Sale Of Common Stock Through At Market Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock authorized amount |  |  |  | 1,000,000,000 |  | $ 500,000,000 |  |  |  |  |  |
Subsequent Event | Common Stock | Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock under forward equity sale agreement | shares |  |  |  |  |  |  | 20,000,000 |  |  |  |  |
Aggregate proceeds from issuance of shares of common stock |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |
Subsequent Event | Maximum | Common Stock | Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Full physical settlement of forward sale agreements date |  |  |  |  |  |  | Dec. 31, 2018 |  |  |  |  |
Subsequent Event | Underwriters Option to Purchase | Common Stock | Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock under option to purchase | shares |  |  |  |  |  |  | 2,100,000 |  |  |  |  |
Issuance of shares of common stock under option to purchase, price per share | $ / shares |  | $ 67.33 |  |  |  |  | $ 67.33 |  |  |  |  |
Period to purchase common stock under option |  |  |  |  |  |  | 30 days |  |  |  |  |
Subsequent Event | Underwriters Option to Purchase | Maximum | Common Stock | Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock under option to purchase | shares |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
Dominion Energy Midstream Partners, LP | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 500,000,000 |  |  |  |  | 500,000,000 |  |  |  |
Guarantee recorded amount |  |  | $ 0 |  |  |  |  | 0 |  |  |  |
Line of credit facility maturity date |  |  | Mar. 31, 2021 |  |  |  |  |  |  |  |  |
Dominion Energy Midstream Partners, LP | Revolving Credit Facility | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 250,000,000 |  |  |  |  | 250,000,000 |  |  |  |
Dominion Energy Midstream Partners, LP | Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Guarantee recorded amount |  |  |  |  |  |  |  |  |  | $ 73,000,000 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  | 426,000,000 |  |  |  |  | 426,000,000 |  |  | $ 542,000,000 | [2]
Credit facility |  |  | 100,000,000 |  |  |  |  | $ 100,000,000 |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  | 0 | 0 |  |  |
Virginia Electric and Power Company | Tax Exempt Financing |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of variable rate tax-exempt financings |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
$6 billion Joint Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [3] |  | 6,000,000,000 |  |  |  |  | $ 6,000,000,000 |  |  |  |
$6 billion Joint Revolving Credit Facility | Questar Gas |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 250,000,000 |  |  |  |  | 250,000,000 |  |  |  |
$6 billion Joint Revolving Credit Facility | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [4] |  | 6,000,000,000 |  |  |  |  | 6,000,000,000 |  |  |  |
Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | SBL Holdco |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 30,000,000 |  |  |  |  | $ 30,000,000 |  |  |  |
Automatic renewal period |  |  |  |  |  |  |  | 1 year |  |  |  |
Short-term debt |  |  | 0 |  |  |  |  | $ 0 |  |  |  |
Credit Facilities, Maturing in May 2018 with 1 year Automatic Renewals through 2024 | Dominion Solar Projects III, Inc |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 25,000,000 |  |  |  |  | $ 25,000,000 |  |  |  |
Automatic renewal period |  |  |  |  |  |  |  | 1 year |  |  |  |
Short-term debt |  |  | 0 |  |  |  |  | $ 0 |  |  |  |
Term Loan Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Guarantee recorded amount |  |  |  | $ 950,000,000 |  |  |  |  |  |  |  |
Duration of credit facilities |  |  |  | 364 days |  |  |  |  |  |  |  |
Maximum allowed total debt to total capital ratio |  |  |  | 67.50% |  |  |  |  |  |  |  |
3.53% Due 2028 | Dominion Energy Midstream Partners, LP | Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 3.53% |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2028 |  |  |  |  |  |  |
3.91% Due 2038 | Dominion Energy Midstream Partners, LP | Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 3.91% |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2038 |  |  |  |  |  |  |
Senior Notes, Due in 2028 | Virginia Electric and Power Company | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  | $ 700,000,000 |  |  |  |  | $ 700,000,000 |  |  |  |
Interest rate percentage |  |  | 3.80% |  |  |  |  | 3.80% |  |  |  |
Debt maturity year |  |  | 2028 |  |  |  |  |  |  |  |  |
3.30% Due 2030 | Questar Gas | Subsequent Event | Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  | $ 50,000,000 |  |  |  |  | $ 50,000,000 |  |  |  |  |
Interest rate percentage |  | 3.30% |  |  |  |  | 3.30% |  |  |  |  |
Debt maturity year |  | 2030 |  |  |  |  |  |  |  |  |  |
3.97% Due 2047 | Questar Gas | Subsequent Event | Private Placement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  | $ 100,000,000 |  |  |  |  | $ 100,000,000 |  |  |  |  |
Interest rate percentage |  | 3.97% |  |  |  |  | 3.97% |  |  |  |  |
Debt maturity year |  | 2047 |  |  |  |  |  |  |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2017 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | This credit facility matures in March 2023 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.
[4] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the Companies multiple times per year. At March 31, 2018, the sub-limit for Virginia Power was $1.5 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 Energy. This credit facility matures in March 2023 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.

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