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Employee Benefit Plans (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 31, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions to defined benefit pension plans and OPEB plans |  |  | $ 0 |
Expected contribution to voluntary employees' beneficiary association |  |  | 12,000,000 |
Dominion Energy Questar Corporation | Capital Contribution to Dominion Energy Questar to Fund Pension Contributions |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contribution to qualified pension plan | $ 75,000,000 |  |  |
Medical Coverage for Local 69 retirees |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Retirement age |  | 65 years |  |
Decrease in accumulated postretirement benefit obligation |  | $ 73,000,000 |  |
Discount rate percentage |  | 4.30% |  |
Charge recorded from plan amendment and remeasurement |  |  | 7,000,000 |
Charge recorded from plan amendment and remeasurement, after tax |  |  | 4,000,000 |
Dominion Energy Gas Holdings, LLC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions to defined benefit pension plans and OPEB plans |  |  | 0 |
Contribution to qualified pension plan |  |  | 15,000,000 | $ 150,000,000
Expected contribution to voluntary employees' beneficiary association |  |  | 12,000,000 |
Dominion Energy Gas Holdings, LLC | Medical Coverage for Local 69 retirees |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Decrease in accumulated postretirement benefit obligation |  | $ 61,000,000 |  |
Charge recorded from plan amendment and remeasurement |  |  | 6,000,000 |
Charge recorded from plan amendment and remeasurement, after tax |  |  | $ 4,000,000 |
Special Termination Benefits | Organizational Design Initiative |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Organizational design initiative |  |  |  | 65,000,000
Organizational design initiative, after tax |  |  |  | 40,000,000
Special Termination Benefits | Organizational Design Initiative | Virginia Electric and Power Company |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Organizational design initiative |  |  |  | 33,000,000
Organizational design initiative, after tax |  |  |  | 20,000,000
Special Termination Benefits | Organizational Design Initiative | Dominion Energy Gas Holdings, LLC |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Organizational design initiative |  |  |  | 8,000,000
Organizational design initiative, after tax |  |  |  | $ 5,000,000

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