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Employee Benefit Plans (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2017 | Mar. 31, 2017 | Mar. 31, 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 Questar Corporation | Capital Contribution to Dominion 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 |
Virginia Electric and Power Company |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution to qualified pension plan |  | 445,000,000 | $ 0
Dominion Gas Holdings, LLC |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to defined benefit pension plans and OPEB plans |  | 0 |
Contribution to qualified pension plan |  | 7,000,000 | 0
Expected contribution to voluntary employees' beneficiary association |  | 12,000,000 |
Dominion 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 |  |  | 70,000,000
Organizational design initiative, after tax |  |  | 43,000,000
Special Termination Benefits | Organizational Design Initiative | Virginia Electric and Power Company |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Organizational design initiative |  |  | 40,000,000
Organizational design initiative, after tax |  |  | 25,000,000
Special Termination Benefits | Organizational Design Initiative | Dominion 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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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Increase (Decrease) for Plan Amendment + References No definition available. + Details
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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Increase (Decrease) for Plan Amendment, After Tax + References No definition available. + Details
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- Definition Defined Benefit Plan, Plan Amendment, Retirement Age + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in the accumulated benefit obligation related to the effects of a change in the substantive terms of an existing defined benefit pension plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=49173939 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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