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Regulatory Matters (Narrative) (Detail) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2019 USD ($) | Sep. 01, 2019 USD ($) | Jun. 01, 2019 USD ($) | Mar. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2015 USD ($) Building | Nov. 30, 2013 kV mi | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment pre tax charge |  |  |  |  |  |  |  |  |  |  |  | $ 312 | $ 134 | $ 1,147 | $ 135 |  |  |  |
Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  | $ (254) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utah Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of earned return |  |  |  |  | 9.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  |  | 9.85% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return of equity percentage |  |  |  |  | 10.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utah Commission | Scenario Forecast | Annual Base Fuel Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DETI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of costs of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 129 |  |  |  |  |  |
Disallowance of costs of property, plant and equipment, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 94 |  |  |  |  |  |
DETI | Federal Energy Regulatory Commission | Supply Header Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment pre tax charge |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |
Asset impairment after tax charge |  |  |  |  |  | $ 10 |  |  |  |  |  | 10 |  | 10 |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities one time bill credit reduction amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 13 |  |  |  |  |  |
Asset impairment pre tax charge |  |  |  |  |  |  |  |  |  |  |  | 197 |  | 743 |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed annual revenue reduction amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 171 |  |  |  |  |
Interim rate reduction amount |  |  |  |  | $ 125 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual revenue reduction amount |  |  |  |  |  |  |  | $ 183 |  |  |  |  |  |  |  |  |  |  |
Estimated annual revenue reduction on one-time customer credit |  |  |  |  |  |  |  | 132 |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement recovered balance |  |  | $ 107 |  |  |  | $ 124 |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  | (192) |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Surry Switching Station Transmission Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Length of transmission 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 transmission line (miles) | mi |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |
Capacity of transmission line (kV) | kV |  |  |  |  |  |  |  |  |  |  | 230 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider T1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  | $ 446 |  |  |  |  | 1,500 |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  | 271 |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  |  |  | 920 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider T1 | Transmission Component Of Base Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  |  |  | 474 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Solar Development Project | Rider US-4 | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  | $ 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | South Carolina Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total estimated capital investment |  |  |  |  |  | 146 |  |  |  |  |  | $ 146 |  | $ 146 |  |  |  |  |
DESC | South Carolina Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  |  | $ 437 |  |  |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation | Percentage Of Income Payment Plan Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refund of over-recovery of accumulated arrearages |  |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |  |
Recovery of projected deferred program costs |  |  |  |  |  |  | $ 8 |  |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation | UEX Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elimination of over-recovered balance of accumulated bad debt expense |  |  |  |  |  |  |  | $ 3 |  |  |  |  |  |  |  |  |  |  |
East Ohio | Ohio Regulation | Scenario Forecast | UEX Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of prospective net bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |
Hope Gas, Inc. | West Virginia Regulation | PREP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hope Gas, Inc. | West Virginia Regulation | Scenario Forecast | PREP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected capital investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39 |  | $ 29 |
Cove Point | West Virginia Regulation | PREP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30
Cove Point | Federal Energy Regulatory Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities expected cost to acquire productive assets |  |  |  |  |  |  |  |  |  | $ 150 |  |  |  |  |  |  |  |  |
Public utilities number of binding precedent agreements for project facilities | Building |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Estimated Cost of project |  |  |  |  |  |  |  |  | $ 45 |  |  |  |  |  |  |  |  |  |
Asset impairment pre tax charge |  |  |  |  |  |  |  |  | 37 |  |  |  |  |  |  |  |  |  |
Asset impairment after tax charge |  |  |  |  |  |  |  |  | $ 28 |  |  |  |  |  |  |  |  |  | $ 28

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