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Regulatory Matters (Narrative) (Details) $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) Case | Jun. 30, 2017 USD ($) program | May 31, 2017 USD ($) | Apr. 30, 2017 kV mi | Jun. 30, 2016 USD ($) | Mar. 31, 2016 kV mi | Nov. 30, 2013 kV mi | Aug. 31, 2009 kV | Apr. 30, 2008 | Apr. 30, 2007 kV | Jun. 30, 2017 USD ($) power_station | Mar. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets-noncurrent |  |  |  | $ 2,487 |  |  |  |  |  |  |  |  | $ 2,487 |  |  |  | $ 2,473 | [1]
Regulatory asset recovered through retail rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets-noncurrent | [2] |  |  | 207 |  |  |  |  |  |  |  |  | 207 |  |  |  | 192 |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROE (percentage) |  |  |  |  |  |  |  |  |  |  | 11.40% |  |  |  |  |  |  |
Regulatory assets-noncurrent |  |  |  | 851 |  |  |  |  |  |  |  |  | 851 |  |  |  | 770 | [3]
Proposed revenue requirement |  |  |  |  | $ 625 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Rider T1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | 135 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Regulatory asset recovered through retail rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets-noncurrent | [2] |  |  | 207 |  |  |  |  |  |  |  |  | 207 |  |  |  | $ 192 |
Virginia Electric and Power Company | Transmission Component of Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | 490 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 215 |  |  |  |  |  |  |  |  | 215 |  |  |  |  |
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 |  |  |  | 207 |  |  |  |  |  |  |  |  | $ 207 |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligated to make payments to fund improvements for historical and cultural resiurces |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90 |  |
Virginia Electric and Power Company | Virginia Regulation | Transmission Line between Cunningham switching station and Dooms substation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of kV line (miles) | mi |  |  |  |  |  |  |  | 33 |  |  |  |  |  |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |
Total estimated cost of project |  |  |  |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Surry Switching Station Transmission Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of kV line (miles) | mi |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Transmission Line from Skiffes Creek Switching Station to Wheaton Substation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of kV line (miles) | mi |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  |  | 230 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor Submitted to the Virginia Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  | $ 279 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider S |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  | 245 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider W |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  | 126 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  | 74 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  | 42 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power stations | power_station |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider GV |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  | 104 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 22 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Riders C1A and C2A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROE (percentage) |  |  |  | 9.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | $ 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new energy efficiency programs | program |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider BW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | $ 127 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider US-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved revenue required |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider T1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  | $ (55) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event | Transmission Line Near Gainesville Substation and Haymarket Substation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of requests to evaluate and reconsider its decision over the case | Case |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility operating capacity (kV) | kV |  |  |  |  |  |  |  |  |  | 500 |  | 500 |  |  |  |  |  |
Virginia Electric and Power Company | Maximum | Virginia Regulation | Riders C1A and C2A | Peak Shaving Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DETI | FERC Gas Regulation | Subsequent Event | Other Operations And Maintenance Expense | Preliminary recommendation one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audit compliance charge recognized in connection with preliminary recommendation |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audit compliance after-tax charge recognized in connection with preliminary recommendation |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DETI | FERC Gas Regulation | Subsequent Event | Other Operations And Maintenance Expense | Other preliminary recommendation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audit compliance charge recognized in connection with preliminary recommendation |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Audit compliance after-tax charge recognized in connection with preliminary recommendation |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation | PIPP Plus Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refund of overrecovery of accumulated arrearages |  | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation | UEX Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elimination of over-recovered balance of accumulated bad debt expense |  | $ 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation | Scenario, Forecast | PIPP Plus Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of projected deferred program costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19 |  |  |
East Ohio | Ohio Regulation | Scenario, Forecast | UEX Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prospective bad debt expense recovered |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22 |  |  |  |
East Ohio | Ohio Regulation | Subsequent Event | PIPP Plus Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval waiting period from date of filing |  |  | 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Dominion Energy’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 the 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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