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Commitments and Contingencies (Nuclear Operations) (Narrative) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |
NRC minimum requirement for nuclear power plant licensees | $ 1,060,000,000 |  |  | $ 1,060,000,000 |  |
Maximum assessment for premiums on insurance policy |  |  |  | 83,000,000 |  |
Maximum assessment for insurance policy |  |  |  | 21,000,000 |  |
Spent Nuclear Fuel |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Receivables | 49,000,000 |  |  | 49,000,000 | $ 46,000,000 |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Amount that could be assessed for each licensed reactor | 138,000,000 |  |  | 138,000,000 |  |
Amount that could be assessed for each licensed reactor per reactor | 21,000,000 |  |  | $ 21,000,000 |  |
Nuclear Obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum liability protection per nuclear incident amount | 14,100,000,000 | $ 13,100,000,000 | $ 13,400,000,000 |  |  |
Inflationary provision adjustment period |  |  |  | 5 years |  |
Virginia Electric and Power Company |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum assessment for premiums on insurance policy |  |  |  | $ 51,000,000 |  |
Maximum assessment for insurance policy |  |  |  | 10,000,000 |  |
Virginia Electric and Power Company | Spent Nuclear Fuel |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Receivables | 30,000,000 |  |  | 30,000,000 | 30,000,000 |
Dominion Energy and Virginia Electric and Power |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Amount of coverage purchased from commercial insurance pools | 450,000,000 |  |  | 450,000,000 |  |
Surry and North Anna |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount |  |  |  | 16,000,000 | 22,000,000 | $ 30,000,000
Millstone |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Settlement amount |  |  |  | 13,000,000 | $ 14,000,000 | $ 22,000,000
Millstone Unit 1 |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Minimum financial assurance | 2,700,000,000 |  |  | 2,700,000,000 |  |
Kewaunee | Nuclear Obligations |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Maximum liability protection per nuclear incident amount |  |  |  | 100,000,000 |  |
Kewaunee | Virginia Electric and Power Company |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Minimum financial assurance | $ 1,800,000,000 |  |  | $ 1,800,000,000 |  |

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