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Acquisitions and Dispositions (Acquisition of Dominion Energy Questar) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 16, 2016 | Sep. 30, 2016 | Aug. 31, 2016 | Apr. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Issuance of common stock |  |  |  |  | $ 156 | $ 1,458
Issuance of common stock |  |  |  |  | $ 156 | $ 1,458
Dominion Energy Questar Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Price per share | $ 25.00 |  |  |  |  |
Total consideration | $ 4,400 |  |  |  |  |
Number of shares of Dominion Questar outstanding at closing | 175.5 |  |  |  |  |
August 2016 issuance of senior notes |  |  | $ 1,300 |  |  |
Dominion Energy Questar Corporation | Term loan agreement |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Borrowing under term loan |  | $ 1,200 |  |  |  |
Dominion Energy Questar Corporation | Underwritten Public Offering |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Issuance of common stock |  |  |  | $ 500 |  |
Dominion Energy Questar Corporation | Series A RSNs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Issuance of common stock |  |  | $ 1,400 |  |  |

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