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Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Debt |  |  |  | $ 5,682.0 | $ 1,572.0 | $ 1,610.0
Term Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Estimated mandatory prepayments due within one year |  |  |  | $ 20.0 |  |
Dominion Energy Midstream Partners, LP |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Debt |  | $ 250.0 |  |  |  |
Repayment of outstanding credit facility balance | $ 73.0 |  | $ 73.0 |  |  |
Variable Rate Term Loan | Dominion Energy Midstream Partners, LP |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Debt | $ 300.0 |  |  |  |  |

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