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Significant Financing Transactions (Narrative) (Detail) |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 14, 2019 USD ($) $ / shares shares | Jun. 30, 2022 shares | Jul. 31, 2019 USD ($) | May 31, 2019 USD ($) Bond | Mar. 31, 2019 USD ($) | Feb. 28, 2019 USD ($) | Jan. 31, 2019 USD ($) shares | Jun. 30, 2018 USD ($) shares | Apr. 30, 2018 shares | Apr. 30, 2018 shares | Jun. 30, 2019 USD ($) shares | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1] |  |  |  |  |  |  |  |  |  |  | $ 6,000,000,000 |  |  | $ 6,000,000,000 |  |  |
Short-term debt |  |  |  |  |  |  |  |  |  |  |  | 2,547,000,000 |  |  | 2,547,000,000 |  | $ 334,000,000 |
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,378,000,000 | $ 2,840,000,000 |  |
Tender offer expiration description |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Both DESC tender offers and the SCANA tender offer expired in the first quarter of 2019. |  |  |
Number of shares received | shares |  |  |  |  |  |  |  |  | 26,700,000 |  |  |  |  | 26,700,000 |  | 26,700,000 |  |
Increase (decrease) Non-controlling interest |  |  |  |  |  |  |  |  | $ 375,000,000 |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,818,000,000 |  |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (40,000,000) |  |  |
Cash proceeds received from common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 | $ 662,000,000 |  |
Issuance costs |  | $ 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock value |  |  |  |  |  |  |  |  |  |  |  | $ 1,674,000,000 |  | $ 82,000,000 | $ 1,921,000,000 | $ 662,000,000 |  |
Shelf Registration For Sale Of Common Stock Through At Market Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |
Cash proceeds received from common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 154,000,000 |  |  |
Issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |
Issuance of common stock value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 645,000,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,000,000 |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,818,000,000 |  |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,181,000,000 |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  | 1,000,000 | 4,000,000 | 9,000,000 |  |
Issuance costs |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock value |  |  |  |  |  |  |  |  |  |  |  | $ 78,000,000 |  | $ 82,000,000 | $ 325,000,000 | $ 662,000,000 |  |
Common Stock | Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds received from common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |
Issuance of shares of common stock under forward equity sale agreement | shares |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |
Common Stock | Underwriters Option to Purchase | Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,100,000 |
Period to purchase common stock under option |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |
Issuance of shares of common stock under option to purchase | shares |  |  |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |
Common Stock | Maximum | Underwriters Option to Purchase | Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of common stock under option to purchase | shares |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
2019 Corporate Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in undivided beneficial ownership |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares |  | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Corporate Units | Scenario Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares to be issued under purchase contracts | shares |  |  | 21,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Corporate Units | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price to be paid under stock purchase contracts | $ / shares |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 2006 Hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  | 12,000,000 |  |  |
September 2006 Hybrids |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  | 13,000,000 |  |  |
Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  | $ 73,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition | shares |  |  |  |  |  |  |  | 22,500,000 |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |
Right to receive conversion of common stock | shares |  |  |  |  |  |  |  | 0.2492 |  |  |  |  |  |  |  |  |  |
Gain or loss recognized in equity transaction |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [2] |  |  |  |  |  |  |  |  |  |  | 6,000,000,000 |  |  | 6,000,000,000 |  |  |
Short-term debt |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |  | 1,300,000,000 |  | $ 314,000,000 | [3]
Repayment of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 589,000,000 | $ 951,000,000 |  |
Issuance of common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 | 0 |  |
Virginia Electric and Power Company | Tax Exempt Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of series of tax exempt bonds | Bond |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal amount |  |  |  |  | $ 198,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit sub-limit |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  | $ 500,000,000 |  |  |
Repurchase of first mortgage bonds |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 |  |  |  |  |
SCANA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of medium term notes |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition | shares |  |  |  |  |  |  |  | 95,600,000 |  |  |  |  |  |  |  |  |  |
Shares of common stock issued in acquisition, value |  |  |  |  |  |  |  | $ 6,800,000,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |
Variable Rate Term Loan | Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Due in 2049 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |
Interest rate percentage |  |  |  |  |  | 4.60% |  |  |  |  |  |  | 4.60% |  |  |  |  |
Debt maturity year |  |  |  |  |  | 2049 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Due in 2028 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |
Interest rate percentage |  |  |  |  |  | 4.25% |  |  |  |  |  |  | 4.25% |  |  |  |  |
Debt maturity year |  |  |  |  |  | 2028 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Due in 2024 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  | $ 33,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 5.49% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
1.8% Tax-Exempt Bond | Virginia Electric and Power Company | Tax Exempt Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 1.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Number of series of tax exempt bonds | Bond |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
1.9% Tax-Exempt Bond | Virginia Electric and Power Company | Tax Exempt Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 1.90% |  |  |  |  |  |  |  |  |  |  |  |  |
Number of series of tax exempt bonds | Bond |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Due in 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  | 2.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  | 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Due in 2029 | Tax Exempt Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remarketable Subordinated Notes, 2016 Series A-1, due 2021 | Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  | $ 700,000,000 |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  | 2.00% |  |  |
Remarketable Subordinated Notes, 2016 Series A-2, due 2024 | Capital Unit, Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  | $ 700,000,000 |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  | 2.00% |  |  |
Series A-1 Junior Subordinated Notes | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  |  |  |  | 2.715% |  |  | 2.715% |  |  |
Series A-2 Junior Subordinated Notes | Unsecured Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  |  |  |  | 3.071% |  |  | 3.071% |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000.0 |  |  | $ 2,000,000,000.0 |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000.0 |  |  | 2,000,000,000.0 |  |  |
Letter of Credit | DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terminated credit facility |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  | 21,000,000 |  |  | 21,000,000 |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  | $ 11,000,000 |  |  |
Line of credit facility, termination date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2020 |  |  |
Revolving Credit Facility | Dominion Energy Midstream Partners, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terminated credit facility |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | This credit facility matures in March 2023 and can be used by the borrowers under the credit facility 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.
[2] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At June 30, 2019, 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.
[3] | Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.

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