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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) $ in Millions | Dec. 31, 2017 USD ($)
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Debt Instrument [Line Items] |  |
2018 | $ 3,311 |
2019 | 4,286 |
2020 | 2,035 |
2021 | 2,185 |
2022 | 1,534 |
Thereafter | 20,942 |
Total | $ 34,293 |
Weighted- average Coupon, 2018 | 3.62% |
Weighted- average Coupon, 2019 | 2.89% |
Weighted- average Coupon, 2020 | 2.58% |
Weighted- average Coupon, 2021 | 3.12% |
Weighted- average Coupon, 2022 | 2.97% |
Weighted- average Coupon, Thereafter | 4.38% |
Unsecured Senior Notes |  |
Debt Instrument [Line Items] |  |
2018 | $ 3,275 | [1]
2019 | 3,400 | [1]
2020 | 1,000 | [1]
2021 | 900 | [1]
2022 | 1,500 | [1]
Thereafter | 17,058 | [1]
Total | 27,133 | [1]
Tax-Exempt Financings |  |
Debt Instrument [Line Items] |  |
Thereafter | 805 |
Total | 805 |
Term Loans |  |
Debt Instrument [Line Items] |  |
2018 | 36 | [2]
2019 | 336 | [2]
2020 | 35 | [2]
2021 | 35 | [2]
2022 | 34 | [2]
Thereafter | 462 | [2]
Total | 938 | [2]
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 |
Unsecured 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 |
Dominion Energy Gas Holdings, LLC |  |
Debt Instrument [Line Items] |  |
2019 | 450 |
2020 | 700 |
Thereafter | 2,450 |
Total | $ 3,600 |
Weighted- average Coupon, 2019 | 2.50% |
Weighted- average Coupon, 2020 | 2.80% |
Weighted- average Coupon, Thereafter | 3.90% |
Virginia Electric and Power Company |  |
Debt Instrument [Line Items] |  |
2018 | $ 850 |
2019 | 350 |
2022 | 750 |
Thereafter | 9,468 |
Total | $ 11,418 |
Weighted- average Coupon, 2018 | 4.17% |
Weighted- average Coupon, 2019 | 5.00% |
Weighted- average Coupon, 2022 | 3.15% |
Weighted- average Coupon, Thereafter | 4.33% |
Virginia Electric and Power Company | Unsecured Senior Notes |  |
Debt Instrument [Line Items] |  |
2018 | $ 850 |
2019 | 350 |
2022 | 750 |
Thereafter | 8,690 |
Total | 10,640 |
Virginia Electric and Power Company | Tax-Exempt Financings |  |
Debt Instrument [Line Items] |  |
Thereafter | 778 |
Total | $ 778 |
[1] | In February 2018, $250 million of Dominion Energy Questar Pipeline's senior notes were repaid using proceeds from the January 2018 issuance, through private placements, of $100 million of 3.53% senior notes and $150 million of 3.91% senior notes that mature in 2028 and 2038, respectively. As a result, at December 31, 2017, $250 million was included in long-term debt in the Consolidated Balance Sheets.
[2] | 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, 2017, $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.

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