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Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
2019 |  | $ 3,607 |
2020 |  | 2,054 |
2021 |  | 5,279 |
2022 |  | 1,556 |
2023 |  | 1,682 |
Thereafter |  | 20,931 |
Total |  | $ 35,109 | $ 34,293
Weighted- average Coupon, 2019 |  | 3.23% |
Weighted- average Coupon, 2020 |  | 2.80% |
Weighted- average Coupon, 2021 |  | 3.64% |
Weighted- average Coupon, 2022 |  | 3.02% |
Weighted- average Coupon, 2023 |  | 3.41% |
Weighted- average Coupon, Thereafter |  | 4.51% |
Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
2019 |  | $ 2,700 |
2020 |  | 1,000 |
2021 |  | 900 |
2022 |  | 1,500 |
2023 |  | 1,350 |
Thereafter |  | 17,195 |
Total |  | 24,645 |
Tax-Exempt Financings |  |  |
Debt Instrument [Line Items] |  |  |
2023 |  | 40 |
Thereafter |  | 651 |
Total |  | 691 |
Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
2019 | [1],[2] | 336 |
2020 | [1],[2] | 35 |
2021 | [1],[2] | 3,035 |
2022 | [1],[2] | 34 |
2023 | [1],[2] | 273 |
Thereafter | [1],[2] | 169 |
Total | [1],[2] | 3,882 |
Credit facility borrowings |  |  |
Debt Instrument [Line Items] |  |  |
2021 | [2] | 73 |
Total | [2] | 73 |
Secured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
2019 |  | 17 |
2020 |  | 15 |
2021 |  | 17 |
2022 |  | 19 |
2023 |  | 16 |
Thereafter |  | 278 |
Total |  | 362 |
Unsecured Junior Subordinated Notes Payable to Affiliated Trusts |  |  |
Debt Instrument [Line Items] |  |  |
Thereafter |  | 10 |
Total |  | 10 |
Unsecured Junior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
2019 |  | 550 |
2020 |  | 1,000 |
2021 |  | 550 |
Total |  | 2,100 |
Enhanced Junior Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
Thereafter |  | 1,907 |
Total |  | 1,907 |
Remarketable Subordinated Notes |  |  |
Debt Instrument [Line Items] |  |  |
2021 |  | 700 |
Thereafter |  | 700 |
Total |  | 1,400 |
Capital Lease Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
2019 |  | 4 |
2020 |  | 4 |
2021 |  | 4 |
2022 |  | 3 |
2023 |  | 3 |
Thereafter |  | 21 |
Total |  | 39 |
Dominion Energy Gas Holdings, LLC |  |  |
Debt Instrument [Line Items] |  |  |
2019 |  | 450 |
2020 |  | 700 |
2021 |  | 500 |
2023 |  | 650 |
Thereafter |  | 1,787 |
Total |  | $ 4,087 |
Weighted- average Coupon, 2019 |  | 2.50% |
Weighted- average Coupon, 2020 |  | 2.80% |
Weighted- average Coupon, 2021 |  | 3.39% |
Weighted- average Coupon, 2023 |  | 3.29% |
Weighted- average Coupon, Thereafter |  | 4.12% |
Virginia Electric and Power Company |  |  |
Debt Instrument [Line Items] |  |  |
2019 |  | $ 350 |
2022 |  | 750 |
2023 |  | 740 |
Thereafter |  | 9,914 |
Total |  | $ 11,754 |
Weighted- average Coupon, 2019 |  | 5.00% |
Weighted- average Coupon, 2022 |  | 3.15% |
Weighted- average Coupon, 2023 |  | 2.87% |
Weighted- average Coupon, Thereafter |  | 4.45% |
Virginia Electric and Power Company | Unsecured Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
2019 |  | $ 350 |
2022 |  | 750 |
2023 |  | 700 |
Thereafter |  | 9,290 |
Total |  | 11,090 |
Virginia Electric and Power Company | Tax-Exempt Financings |  |  |
Debt Instrument [Line Items] |  |  |
2023 |  | 40 |
Thereafter |  | 624 |
Total |  | $ 664 |
[1] | Excludes mandatory prepayments associated with SBL Holdco and Dominion Solar Projects III, Inc. based on cash flows in excess of debt service. At December 31, 2018, $20 million of estimated mandatory prepayments due within one year were included in securities due within one year in Dominion Energy's Consolidated Balance Sheets.
[2] | In February 2019, Dominion Energy Midstream repaid its $300 million variable rate term loan due in December 2019 and terminated the credit facility due in March 2021 subsequent to repaying the $73 million outstanding balance. As such, credit facility borrowings are presented within current liabilities in Dominion Energy's Consolidated Balance Sheets at December 31, 2018.

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