Asset impairment after tax charge.

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Audit compliance charge with accounting and reporting requirements recognized.

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- Definition

Corporate Income Tax Reduction Refund To Customer

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- Definition

Deferred Credits And Regulatory Liabilities

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- Definition

Dths per day.

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Estimated Annual Revenue Reduction On One Time Bill Credit

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Expected Cost Of Project

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Kilo Volt Line

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- Definition

Legislation Amount Credited In Customer Bill

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Legislation Charge

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Legislation Charge After Tax

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Loss contingency, settlement agreement, duration of settlement payment.

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Mega Volt Line

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Mitigation Recoverable Percentage

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Mitigation Recoverable Remaining Percentage

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Number Of Solar Facility

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Number Of Wind Projects

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Obligated to make payments to fund improvement for historical and cultural resources.

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One Time Bill Credit Provisions For Current Customers

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Payments made to fund improvement for historical and cultural resources.

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Phase-in plan, amount of capitalized costs recoverable.

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Phase-in Plan, Percentage Increase in Capital Investments

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Phase-in Plan, Period for Cost Recovery

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Phase-in Plan, Project PREP Investment

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Public utilities additional revenue to be collected.

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Public utilities annual electric power cost rate adjustment approval request to recover amount.

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Public Utilities Annual Revenue Reduction Amount

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Public utilities annual transportation cost rate adjustment approval request to recover amount.

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Public Utilities, Approved Rate, Amount

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Public utilities expected cost to acquire productive assets.

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Public Utilities Interim Rate Reduction Amount

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Public utilities, length of transmission line.

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Public Utilities Length Of Wind Project

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Public utilities number of binding precedent agreements for project Facilities.

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Public utilities, number of customers with updated automated meter reading technology.

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Public Utilities Number Of New Demand Response Programs

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Public utilities, number of new energy efficiency programs.

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Public Utilities Operating Expense Estimated Fuel Expenses Recovery

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Public utilities, operation capacity of transmission facilities.

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Public utilities, percentage replacement of pipeline system.

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Public utilities, period for cost capitalization.

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Public utilities, property, plant and equipment, expected cost of construction.

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Public utilities requested cost increase decrease amount.

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Public Utilities, Requested Rate, Amount

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Rate reduction.

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Recovery of projected deferred program costs.

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Refund of overrecovery of accumulated arrearages.

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Regulatory Liabilities One Time Bill Credit Amount

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Solar Capacity Factor

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Tax Reform Benefit

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Amount of recoveries of receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of accounts receivable charged against the allowance.

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The increase (decrease) during the reporting period in regulated liabilities. Regulated liabilities are created when regulatory agency permits an entity to defer revenues to the balance sheet.

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Amount awarded to other party in judgment or settlement of litigation.

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Amount of loss contingency liability.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The sum total amount of allowable costs capitalized in the period pertaining to a phase-in plan and previously capitalized costs that were recovered (recognized in earnings) during the period through rates.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of public utility's interim rate increase (decrease) allowed while waiting final decision of regulatory agency.

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Discloses the amount of construction work in process that is included in the rate making process at period end.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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Amount of operating expense for routine plant maintenance and repairs of regulated operation.

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Regulatory Matters (Narrative) (Detail) MMcf in Millions, Customer in Millions, $ in Millions		1 Months Ended																				12 Months Ended
	Feb. 01, 2020	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 30, 2018 USD ($) Project MW mi	Oct. 31, 2018 USD ($) Program	Oct. 30, 2018 MMcf	Sep. 30, 2018 USD ($)	Aug. 31, 2018 USD ($) MMBTU	Jul. 31, 2018 USD ($) Facility	Jun. 30, 2018 USD ($) kV Segment	May 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	May 31, 2017 USD ($)	Nov. 30, 2015 USD ($) kV mi	Jun. 30, 2015 USD ($) Buildings	Mar. 31, 2015 USD ($)	Nov. 30, 2013 kV mi	Aug. 31, 2009 kV	Dec. 31, 2007 Customer	Apr. 30, 2007 kV	Jan. 31, 2020	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) kV Segments mi	Aug. 31, 2018 USD ($) MMBTU	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jul. 31, 2017 USD ($)
Public Utilities General Disclosures [Line Items]
Regulatory assets-noncurrent			$ 2,676.0																						$ 2,676.0			$ 2,480.0
Reduction in regulatory liabilities																									35.0			4,200.0
Annual regulatory liability deferral amount			0.4																						$ 0.4
Separate segments \| Segments																									3
Asset impairment pre tax charge																									$ 403.0			15.0	$ 4.0
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Regulatory assets-noncurrent			737.0																						737.0			810.0
Tax reform benefit								$ 100.0
Reduction in regulatory liabilities					$ 14.0																				$ 31.0			2,600.0
Regulatory liabilities one time bill credit amount					13.0
Separate segments \| Segments																									2
Virginia Electric and Power Company \| Minimum
Public Utilities General Disclosures [Line Items]
Facility operating capacity (kV) \| kV																					500
Virginia Electric and Power Company \| Minimum \| Judicial Ruling
Public Utilities General Disclosures [Line Items]
Facility operating capacity (kV) \| kV																			500
Virginia Electric and Power Company \| Scenario, Forecast
Public Utilities General Disclosures [Line Items]
Asset impairment pre tax charge																							$ 190.0
Virginia Electric and Power Company \| FERC-regulated \| Settled Litigation \| Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers \| Unfavorable Regulatory Action \| Other Deferred Credits And Other Liabilities
Public Utilities General Disclosures [Line Items]
Amount of contingent liability			50.0																						$ 50.0
Virginia Electric and Power Company \| FERC-regulated \| Settled Litigation \| Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers \| Unfavorable Regulatory Action \| Current Liabilities
Public Utilities General Disclosures [Line Items]
Amount of contingent liability			126.0																						126.0
Virginia Electric and Power Company \| FERC-regulated \| Settled Litigation \| Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers \| Unfavorable Regulatory Action \| PJM transmission rates
Public Utilities General Disclosures [Line Items]
Regulatory assets-noncurrent								$ 265.0																		$ 265.0
Duration of payment under settlement agreement								10 years
Amount required to pay under settlement agreement								$ 276.0
Virginia Electric and Power Company \| Virginia Regulation
Public Utilities General Disclosures [Line Items]
Proposed annual revenue reduction amount					151.0																				190.0
Interim rate reduction amount									$ 125.0
Rate reduction																									50.0
One-time bill credit, provisions for current customers																									200.0
Charge associated with legislation																									215.0
Charge associated with legislation, after tax																									$ 160.0
Legislation amount credited in customer bill									138.0
Proposed revenue requirement											$ 1,500.0
Increase in fuel revenue								209.0			222.0
Capacity of transmission line (kV) \| kV																									115
Obligated to make payments to fund improvement for historical and cultural resources																														$ 90.0
Payments made to fund improvement for historical and cultural resources																												90.0
Virginia Electric and Power Company \| Virginia Regulation \| Operating Segments
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement				$ 628.0				636.0						$ 755.0
Virginia Electric and Power Company \| Virginia Regulation \| Transmission Component of Virginia Power's \| Operating Segments
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement														468.0
Virginia Electric and Power Company \| Virginia Regulation \| Coastal Virginia Offshore Wind Project
Public Utilities General Disclosures [Line Items]
The total estimated capital investment				$ 300.0
Capacity of wind turbine generators \| MW				6
Public utilities length of wind project \| mi				27
Number of wind projects \| Project				2
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]
The total estimated capital investment															$ 180.0
Length of kV line (miles) \| mi															5
Capacity of transmission line (kV) \| kV															230
Virginia Electric and Power Company \| Virginia Regulation \| Double Circuit Transmission Line Between Near Gainesville Substation And Haymarket Substation
Public Utilities General Disclosures [Line Items]
Capacity of transmission line (kV) \| kV															230
Virginia Electric and Power Company \| Virginia Regulation \| Transmission Line Between Idylwood and Tysons Substations
Public Utilities General Disclosures [Line Items]
The total estimated capital investment			125.0							$ 30.0															$ 125.0
Length of kV line (miles) \| mi																									4.0
Capacity of transmission line (kV) \| kV										230															230
Separate segments \| Segment										4
Virginia Electric and Power Company \| Virginia Regulation \| Transmission Line Between The Idylwood And Tysons Substations
Public Utilities General Disclosures [Line Items]
The total estimated capital investment			816.0																						$ 816.0
Operations and maintenance expenses																									102.0
Virginia Electric and Power Company \| Virginia Regulation \| Rider T1 \| Operating Segments
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement								630.0						287.0
Increase (decrease) in revenue requirement														$ (146.0)
Virginia Electric and Power Company \| Virginia Regulation \| Rider U
Public Utilities General Disclosures [Line Items]
Approved revenue required			70.0										$ 73.0
Virginia Electric and Power Company \| Virginia Regulation \| Riders C1A and C2A \| Energy Efficiency Program \| Operating Segments
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement					18.0
Approved revenue required					$ 49.0
Number of new energy efficiency programs \| Program					10
Period for cost cap					5 years
Number of new demand response programs \| Program					1
Amount of cost recovery					$ 262.0
Virginia Electric and Power Company \| Virginia Regulation \| Solar Development Project
Public Utilities General Disclosures [Line Items]
The total estimated capital investment									$ 410.0
Number of solar facility \| Facility									2
Virginia Electric and Power Company \| Virginia Regulation \| Solar Development Project \| Rider US-3 \| Operating Segments
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement									$ 10.0
Virginia Electric and Power Company \| Virginia Regulation \| Subsequent Event
Public Utilities General Disclosures [Line Items]
Proposed annual revenue reduction amount		$ 171.0
Expected annual revenue reduction on one-time bill credit		120.0
Interim rate reduction amount		120.0
Legislation amount credited in customer bill		77.0
Virginia Electric and Power Company \| Virginia Regulation \| Subsequent Event \| Transmission Line Between The Idylwood And Tysons Substations
Public Utilities General Disclosures [Line Items]
The total estimated capital investment		$ 68.0
Virginia Electric and Power Company \| Virginia Regulation \| Subsequent Event \| Solar Development Project \| Rider US-3 \| Operating Segments
Public Utilities General Disclosures [Line Items]
Performance guarantee of the facilities		20 years
Solar capacity factor when normalized for force majeure events		25.00%
Virginia Electric and Power Company \| Virginia Regulation \| Third Phase \| Rider U
Public Utilities General Disclosures [Line Items]
Projected capital investment			179.0										179.0
Virginia Electric and Power Company \| Virginia Regulation \| Second Phase \| Rider U
Public Utilities General Disclosures [Line Items]
Projected capital investment			64.0										65.0
Virginia Electric and Power Company \| North Carolina Regulation \| Annual Base Fuel Revenues
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement								$ 24.0
Virginia Electric and Power Company \| North Carolina Regulation \| Subsequent Event \| Annual Base Fuel Revenues
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement		$ 24.0
Virginia Electric and Power Company \| North Carolina Regulation \| Scenario, Forecast
Public Utilities General Disclosures [Line Items]
Mitigation recoverable percentage																						50.00%
Mitigation recoverable remaining percentage	50.00%
DETI
Public Utilities General Disclosures [Line Items]
Expected cost of project																										$ 95.0
Agreement to provide Dths per day of transportation service \| MMBTU								150,000																		150,000
DETI \| FERC-regulated \| Supply Header Project \| Atlantic Coast Pipeline
Public Utilities General Disclosures [Line Items]
Annual electric power cost rate adjustment, approval amount requested to recover amount							$ 7.0
Annual transportation cost rate adjustment, approval amount requested to recover amount							$ 37.0
DETI \| FERC-regulated \| Preliminary recommendation one \| Other operations and maintenance
Public Utilities General Disclosures [Line Items]
Audit compliance charge recognized in connection with preliminary recommendation																									129.0			15.0
Audit compliance after-tax charge recognized in connection with preliminary recommendation																									94.0			9.0
Questar Gas \| Cost-of-service impact of 2017 Tax Reform Act
Public Utilities General Disclosures [Line Items]
Reduction in regulatory liabilities											$ 15.0
Refund to customers related to deferred corporate income tax reduction									$ 9.0
Regulatory liability, amortization period											1 year
Questar Gas \| Utah and Wyoming Regulation \| Pipeline Infrastructure Replacement Program
Public Utilities General Disclosures [Line Items]
Projected capital investment																									85.0
Questar Gas \| Utah and Wyoming Regulation \| Fuel Deferral [Member]
Public Utilities General Disclosures [Line Items]
Proposed cost increase (decrease) amount					$ 48.0						$ 86.0
LNG peaking storage facility, liquefaction rate per day \| MMcf						8.2
Questar Gas \| Utah and Wyoming Regulation \| Scenario, Forecast \| Pipeline Infrastructure Replacement Program
Public Utilities General Disclosures [Line Items]
Public utilities additional revenue to be collected																							11.0
East Ohio \| Ohio Regulation \| Pipeline Infrastructure Replacement Program
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement																									165.0
Percentage replacement of pipeline system																	25.00%
Period for capital investment																	5 years
Actual cumulative PREP Investment																	$ 200.0
Annual percentage increase in capital investment																	3.00%
Total estimated cost			1,400.0																						1,400.0			204.0
East Ohio \| Ohio Regulation \| Automated Meter Reading Program
Public Utilities General Disclosures [Line Items]
Proposed revenue requirement												$ 5.0
Number of customers with automated meter reading technology \| Customer																				1.2
East Ohio \| Ohio Regulation \| Percentage Of Income Payment Plan Rider
Public Utilities General Disclosures [Line Items]
Refund of over-recovery of accumulated arrearages											10.0
Recovery of projected deferred program costs											$ 4.0
East Ohio \| Ohio Regulation \| UEX Rider
Public Utilities General Disclosures [Line Items]
Elimination of over-recovered balance of accumulated bad debt expense													$ 11.0
East Ohio \| Ohio Regulation \| Demand Side Management Costs
Public Utilities General Disclosures [Line Items]
Annual electric power cost rate adjustment, approval amount requested to recover amount				$ 4.0
East Ohio \| Ohio Regulation \| Scenario, Forecast \| UEX Rider
Public Utilities General Disclosures [Line Items]
Recovery of prospective net bad debt expense																								$ 16.0
Hope Gas, Inc. \| West Virginia Regulation \| PREP
Public Utilities General Disclosures [Line Items]
Projected capital investment																									31.0
Amount of cost recovery				$ 8.0																								28.0
Actual cumulative PREP Investment																												48.0
Annual PREP costs recovered																												$ 7.0
Projected PREP investment			31.0																						31.0
Hope Gas, Inc. \| West Virginia Regulation \| Scenario, Forecast \| PREP
Public Utilities General Disclosures [Line Items]
Projected capital investment																							36.0
Projected PREP investment																							$ 29.0
Cove Point \| FERC-regulated \| Supply Header Project \| Atlantic Coast Pipeline
Public Utilities General Disclosures [Line Items]
Annual transportation cost rate adjustment, approval amount requested to recover amount																											$ 30.0
Public utilities expected cost to acquire productive assets																$ 150.0
Public utilities number of binding precedent agreements for project facilities \| Buildings																2
Estimated Cost of project																									45.0
Asset impairment pre tax charge																									37.0
Asset impairment after tax charge			$ 28.0																						$ 28.0