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Regulatory Matters (Narrative) (Details) customer in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Oct. 31, 2016 USD ($) program | Aug. 31, 2016 | Jun. 30, 2016 USD ($) | Aug. 31, 2009 kV | Apr. 30, 2008 | Apr. 30, 2007 kV | Dec. 31, 2017 USD ($) MW | Mar. 31, 2017 USD ($) power_station kV mi | Mar. 31, 2016 USD ($) | Dec. 31, 2008 | Dec. 31, 2007 customer | Dec. 31, 2016 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets-noncurrent |  |  | $ 2,439 |  |  |  |  |  |  |  |  | $ 2,439 |  |  |  | $ 2,473 | [1]
Acquisition of solar development projects |  |  |  |  |  |  |  |  |  |  |  | 94 | $ 0 |  |  |  |
Regulatory asset recovered through retail rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets-noncurrent | [2] |  | 200 |  |  |  |  |  |  |  |  | 200 |  |  |  | 192 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROE (percentage) |  |  |  |  |  |  |  |  | 11.40% |  |  |  |  |  |  |  |
Regulatory assets-noncurrent |  |  | 776 |  |  |  |  |  |  |  |  | 776 |  |  |  | 770 | [3]
Virginia Electric and Power Company | Regulatory asset recovered through retail rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets-noncurrent | [2] |  | 200 |  |  |  |  |  |  |  |  | 200 |  |  |  | 192 |
Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility operating capacity (kV) | kV |  |  |  |  |  |  |  | 500 |  | 500 |  |  |  |  |  |  |
Virginia Electric and Power Company | FERC Gas Regulation | Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers | Unfavorable Regulatory Action | Settled Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount required to pay under settlement agreement (in excess of $200 million) |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |
Duration of payment under settlement agreement |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Amount of contingent liability |  |  | 208 |  |  |  |  |  |  |  |  | 208 |  |  |  |  |
Virginia Electric and Power Company | FERC Gas Regulation | Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers | Unfavorable Regulatory Action | Settled Litigation | Regulatory asset recovered through retail rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets-noncurrent |  |  | 200 |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | North Anna | Intent to Sue Notification Received from Sierra Club Alleging Endangered Species Act Violations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of notice of intent to sue |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Transmission Line Near Gainesville Substation and Haymarket Substation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of kV line (miles) | mi |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  |  |  |  |  | 230 |  |  |  |  |
Total estimated cost of project |  |  | 55 |  |  |  |  |  |  |  |  | $ 55 |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Transmission Line between Carson Switching Station a Terminus Near Rogers Road Switching Station |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of kV line (miles) | mi |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |
Total estimated cost of project |  |  | $ 55 |  |  |  |  |  |  |  |  | $ 55 |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Virginia Commission 2015 Biennial Review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed ROE percentage |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Application filed with Virginia Commission to Construct and Operate the Oceana Solar Facility [Member] | Solar Development Project | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of solar development projects |  |  |  |  |  |  |  |  |  |  | $ 40 |  |  |  |  |  |
MW facility | MW |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | $ 243 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider W |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | 121 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | 72 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | 27 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power stations | power_station |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider GV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | $ 82 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Riders C1A and C2A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | $ 45 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Riders C1A and C2A | Energy Efficiency Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new energy efficiency programs | program |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Period of cost cap |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Duration of program |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Riders C1A and C2A | Peak Shaving Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duration of program |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider BW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | $ 134 |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement increase (decrease) |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider US-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement increase (decrease) |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Maximum | Riders C1A and C2A | Energy Efficiency Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  |  | 178 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Maximum | Riders C1A and C2A | Peak Shaving Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event | Riders C1A and C2A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROE (percentage) |  | 9.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event | Rider BW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROE (percentage) |  | 10.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event | Rider US-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROE (percentage) |  | 9.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of new cost recovery provision (up to $22 million) |  |  | $ 22 |  |  |  |  |  |  |  |  | $ 22 |  |  |  |  |
East Ohio | Ohio Regulation | PIR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of pipeline system |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Gross plant investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 188 |
East Ohio | Ohio Regulation | AMR Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.2 |  |
East Ohio | Ohio Regulation | Subsequent Event | PIR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  | $ 157 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross plant investment |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation | Subsequent Event | AMR Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Reflects amounts related to PJM transmission cost allocation matter. See Note 12 for more information.
[3] | Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.

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