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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contributions to defined benefit pension plans and OPEB plans |  |  | $ 0 |
Dominion Energy Gas Holdings, LLC |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Contributions to defined benefit pension plans and OPEB plans |  |  | 0 |
Expected contribution to voluntary employees' beneficiary association for the remainder of 2019 | $ 12,000,000 |  | 12,000,000 |
Voluntary Retirement Program |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 423,000,000 |  |  |
Voluntary retirement program related charges net of tax | 316,000,000 |  |  |
Increase in pension benefit obligation | 484,000,000 |  |  |
Increase in accumulated postretirement benefit obligation | 101,000,000 |  |  |
Net periodic benefit cost |  |  | 6,000,000 |
Voluntary Retirement Program | Other operations and maintenance |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 288,000,000 |  |  |
Voluntary Retirement Program | Other Taxes |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 23,000,000 |  |  |
Voluntary Retirement Program | Other Income |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 112,000,000 |  |  |
Voluntary Retirement Program | Net Income From Discontinued Operations |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 32,000,000 |  |  |
Voluntary Retirement Program | Virginia Electric and Power Company |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 194,000,000 |  |  |
Voluntary retirement program related charges net of tax | 144,000,000 |  |  |
Voluntary Retirement Program | Virginia Electric and Power Company | Other operations and maintenance |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 186,000,000 |  |  |
Voluntary Retirement Program | Virginia Electric and Power Company | Other Taxes |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 8,000,000 |  |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 74,000,000 |  |  |
Voluntary retirement program related charges net of tax | 58,000,000 |  |  |
Increase in pension benefit obligation | 32,000,000 |  |  |
Increase in accumulated postretirement benefit obligation | 8,000,000 |  |  |
Net periodic benefit cost |  |  | 4,000,000 |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC | Other operations and maintenance |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 39,000,000 |  |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC | Other Taxes |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 2,000,000 |  |  |
Voluntary Retirement Program | Dominion Energy Gas Holdings, LLC | Other Income |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Voluntary retirement program related charges | 1,000,000 |  |  |
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Increase in fair value of plan assets | 671,000,000 |  |  |
Net periodic benefit cost | 77,000,000 | $ 6,000,000 | 82,000,000 | $ 12,000,000
Expected contribution to voluntary employees' beneficiary association for the remainder of 2019 | $ 21,000,000 |  | $ 21,000,000 |
Pension Benefits | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discount rate percentage | 4.07% |  | 4.07% |
Pension Benefits | Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discount rate percentage | 4.10% |  | 4.10% |
Pension Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Increase in fair value of plan assets | $ 146,000,000 |  |  |
Net periodic benefit cost | $ (21,000,000) | (21,000,000) | $ (43,000,000) | (42,000,000)
Discount rate percentage | 4.10% |  | 4.10% |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Increase in fair value of plan assets | $ 156,000,000 |  |  |
Net periodic benefit cost | 20,000,000 | (26,000,000) | $ 2,000,000 | (51,000,000)
Expected contribution to voluntary employees' beneficiary association for the remainder of 2019 | $ 12,000,000 |  | $ 12,000,000 |
Other Postretirement Benefits | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discount rate percentage | 4.05% |  | 4.05% |
Other Postretirement Benefits | Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Discount rate percentage | 4.08% |  | 4.08% |
Other Postretirement Benefits | Dominion Energy Gas Holdings, LLC |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Increase in fair value of plan assets | $ 29,000,000 |  |  |
Net periodic benefit cost | $ (3,000,000) | $ (3,000,000) | $ (6,000,000) | $ (7,000,000)
Discount rate percentage | 4.05% |  | 4.05% |

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