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Long-Term Debt (Narrative) (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Oct. 01, 2024 | Aug. 15, 2016 USD ($) shares | Jul. 01, 2016 shares | Jun. 30, 2016 | Apr. 01, 2016 shares | Jul. 01, 2014 USD ($) shares | Jul. 31, 2017 shares | Aug. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) shares | Apr. 30, 2016 shares | Dec. 31, 2014 USD ($) | Oct. 31, 2014 USD ($) | Jul. 31, 2014 USD ($) | Jun. 30, 2013 USD ($) | Sep. 30, 2011 | Dec. 31, 2016 USD ($) senior_note $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jan. 31, 2017 USD ($) | Jun. 29, 2016 | May 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | Nov. 30, 2014 USD ($) | Jun. 30, 2009 USD ($) | Sep. 30, 2006 USD ($) | Jun. 30, 2006 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,192,000,000 |  |  |  |  |  |  |  |  |  |
Make-whole premium amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 284,000,000 |  |  |  |  |  |  |  |
Period of deferral |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for consideration of proceeds (days) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 180 days | 365 days |  |  |  |  |  |  |  |  |  |
Interest in RSN issued by Dominion (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts | shares |  |  |  |  |  |  |  |  |  |  | 11,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts | shares |  |  |  |  |  |  |  |  |  |  | 14,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts | shares |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts | shares |  |  |  |  |  |  |  | 18,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts (in dollars per unit) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |
Shares reserved and available for issuance | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,900,000 |  |  |  |  |  |  |  |  |  |
Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Dominion Midstream common units, net of offering costs |  |  |  |  |  |  |  |  | $ 1,400,000,000.0 |  |  |  |  | $ 1,000,000,000 | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payment percentage rate on Equity Units |  |  |  |  |  |  | 6.375% |  | 6.75% |  |  |  |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts (in dollars per unit) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  | 28,000,000 | [1] |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit, Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Dominion Midstream common units, net of offering costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payment percentage rate on Equity Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 1,400,000,000.0 | [1] |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  |  |  |
Interest rate (percentage) |  | 2.00% | [1],[2] |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.07% |  |  |  |
Number of shares issued | shares |  |  |  | 8,500,000.0 |  | 8,500,000.0 |  |  |  | 8,500,000.0 | 8,500,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes | Capital Unit, Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000 |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.18% |  |  |  |  |
Remarketable Subordinated Notes, 2014 Series A, due July 1, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in RSN issued by Dominion (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in RSN issued by Dominion (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021 | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in RSN issued by Dominion (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |  |
Aggregate redemption price paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |  | $ 38,000,000 |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000
June 2006 hybrids | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate |  |  |  |  | 2.825% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.30% |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption price paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  | $ 4,000,000 |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
June 2009 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.375% |  |
Aggregate redemption price paid |  |  |  |  |  |  |  |  |  |  |  |  | $ 685,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 685,000,000 |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of outstanding series of senior notes | senior_note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000,000 |  |  |  |  |  |  |  |  |  |
Aggregate redemption price paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000,000 |  |  |  |  |  |  |  |  |  |
Make-whole premium amount |  |  |  |  |  |  |  |  |  |  |  | $ 263,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest charges |  |  |  |  |  |  |  |  |  |  |  | 284,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior Notes, Due in 2019 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.875% |  |  |  |  |  |  |
Senior Notes | Senior Notes, Due in 2022 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding contingent convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,000,000 |  |  |
Shares issued in excess of principal amounts related to converted securities |  |  |  |  |  |  |  |  |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes | Enhanced Junior Subordinated Notes, 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 685,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes | Enhanced Junior Subordinated Notes, 5.75% | LIBOR | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable percentage rate | 3.057% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes | June 2006 and September 2006 hybrids | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount purchased and cancelled |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes | June 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount purchased and cancelled |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes | September 2006 hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount purchased and cancelled |  |  |  |  |  |  |  |  |  | 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes | July 2016 Hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Junior Subordinated Notes | Series A Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.104% |  |  |  |
Unsecured Junior Subordinated Notes | Series B Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.962% |  |  |  |  |
[1] | The maturity dates of the $700 million Series A-1 RSNs and $700 million Series A-2 RSNs are August 15, 2021 and August 15, 2024, respectively.
[2] | Annual interest rate applies to each of the Series A-1 RSNs and Series A-2 RSNs.

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