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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 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 |
Subsequent Event |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Contributions to defined benefit pension plans | $ 21,000,000 |  |  |  |  |
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 |  | 37,000,000 | 484,000,000 |  |  |
Increase in accumulated postretirement benefit obligation |  |  | 101,000,000 |  |  |
Net periodic benefit cost |  | $ 7,000,000 | 6,000,000 |  |  |
Discount rate percentage |  | 3.57% |  |  | 3.57% |
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 | 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 |  |  | 63,000,000 |  |  |
Voluntary retirement program related charges net of tax |  |  | 48,000,000 |  |  |
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 |  |  | 59,000,000 |  |  |
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 |  |  | 3,000,000 |  |  |
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 |  | $ 51,000,000 | $ 671,000,000 |  |  |
Net periodic benefit cost |  | 5,000,000 |  | $ 7,000,000 | $ 87,000,000 | $ 19,000,000
Pension Benefits | Minimum |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Discount rate percentage |  |  | 4.07% |  |  |
Pension Benefits | Maximum [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Discount rate percentage |  |  | 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 |  | (22,000,000) |  | (21,000,000) | (65,000,000) | (63,000,000)
Discount rate percentage |  |  | 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 |  | (24,000,000) |  | (25,000,000) | (22,000,000) | (76,000,000)
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% |  |  |
Other Postretirement Benefits | Maximum [Member] |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Discount rate percentage |  |  | 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 |  | $ (4,000,000) |  | $ (4,000,000) | $ (10,000,000) | $ (11,000,000)
Discount rate percentage |  |  | 4.05% |  |  |

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