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Long-Term Debt (Total Long Term Debt) (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Repayment of Debt |  | $ 1,572 | $ 1,610 | $ 892
Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Estimated mandatory prepayments due within one year |  | 20 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of Debt |  |  | 400 |
Virginia Electric and Power Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of Debt |  | $ 681 | $ 517 | $ 625
Dominion Energy Midstream Partners, LP | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of Debt | $ 250 |  |  |
2.5% and 2.8%, due 2019 and 2020 | Dominion Energy Gas Holdings, LLC | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.50% |  |
2.5% and 2.8%, due 2019 and 2020 | Dominion Energy Gas Holdings, LLC | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.80% |  |
2.875% to 4.8%, due 2023 to 2044 | Dominion Energy Gas Holdings, LLC | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.875% |  |
2.875% to 4.8%, due 2023 to 2044 | Dominion Energy Gas Holdings, LLC | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 4.80% |  |
1.2% to 7.25%, due 2017 to 2022 | Virginia Electric and Power Company | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 1.20% |  |
1.2% to 7.25%, due 2017 to 2022 | Virginia Electric and Power Company | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 7.25% |  |
2.75% to 8.875%, due 2023 to 2047 | Virginia Electric and Power Company | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.75% |  |
2.75% to 8.875%, due 2023 to 2047 | Virginia Electric and Power Company | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 8.875% |  |
1.75% to 5.6%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing [Member] | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 1.75% |  |
1.75% to 5.6%, due 2023 to 2041 | Virginia Electric and Power Company | Tax Exempt Financing [Member] | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 5.60% |  |
1.25% to 6.4%, due 2017 to 2022 | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 1.25% |  |
1.25% to 6.4%, due 2017 to 2022 | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 6.40% |  |
2.85% to 7.0%, due 2024 to 2044 | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.85% |  |
2.85% to 7.0%, due 2024 to 2044 | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 7.00% |  |
: 2.579% to 4.104%, due 2019 to 2021 | Unsecured Junior Subordinated Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.579% |  |
: 2.579% to 4.104%, due 2019 to 2021 | Unsecured Junior Subordinated Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 4.104% |  |
Payable to Affiliated Trust, 8.4% due 2031 | Unsecured Junior Subordinated Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 8.40% |  |
5.25% and 5.75%, due 2054 and 2076 | Unsecured Junior Subordinated Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 5.25% |  |
5.25% and 5.75%, due 2054 and 2076 | Unsecured Junior Subordinated Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 5.75% |  |
Remarketable Subordinated Notes, 1.5% and 2.0%, due 2020 to 2024 | Remarketable Subordinated Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 1.50% |  |
Remarketable Subordinated Notes, 1.5% and 2.0%, due 2020 to 2024 | Remarketable Subordinated Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.00% |  |
6.8% and 6.875%, due 2026 and 2027 | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 6.80% |  |
6.8% and 6.875%, due 2026 and 2027 | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 6.875% |  |
5.31% to 6.85%, due 2017 and 2018 | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 6.85% |  |
5.31% to 6.85%, due 2017 and 2018 | Term Loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 5.31% |  |
2.98% to 7.20%, due 2024 to 2051 | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 2.98% |  |
2.98% to 7.20%, due 2024 to 2051 | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 7.20% |  |
Tax-Exempt Financing, 1.55%, due 2033 | Term Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 1.55% |  |
Unsecured Senior and Medium Term Notes, 5.83% and 6.48%, due 2018 | Dominion Energy Midstream Partners, LP | Senior Notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 5.83% |  |
Unsecured Senior and Medium Term Notes, 5.83% and 6.48%, due 2018 | Dominion Energy Midstream Partners, LP | Senior Notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 6.48% |  |
Unsecured Senior Note, 4.875%, due 2041 | Dominion Energy Midstream Partners, LP | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate |  | 4.875% |  |
3.53% Due 2028 | Dominion Energy Midstream Partners, LP | Private Placement | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of Debt | $ 100 |  |  |
Interest rate | 3.53% |  |  |
3.91% Due 2038 | Dominion Energy Midstream Partners, LP | Private Placement | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of Debt | $ 150 |  |  |
Interest rate | 3.91% |  |  |
Line of Credit | Virginia Electric and Power Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility, to support letters of credit |  | $ 100 |  |

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