XML 102 R85.htm IDEA: XBRL DOCUMENT
v3.20.2

Derivatives and Hedge Accounting Activities (Volume of Derivative Activity) (Detail) - 6 months ended Jun. 30, 2020 | USD ($) MWh Bcf gal | EUR (€)
--- | --- | ---
Fixed Price - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 69 |
Fixed Price - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 38 |
Basis - Natural Gas - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 236 |
Basis - Natural Gas - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 143 |
Fixed Price - Electricity - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 4,964,045 |
Fixed Price - Electricity - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 101,087,887 |
Financial Transmission Rights - Electricity- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 101,087,887 |
Liquids - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal | [2] | 26,460,000 |
Interest Rate - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 1,950,000,000 |
Interest Rate - Current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | 900,000,000 |
Interest Rate - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 750,000,000 |
Foreign Exchange - Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | € 0
Foreign Exchange - Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | 0
Fixed Price - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 32 |
Fixed Price - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | [1] | 8 |
Basis - Natural Gas - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 538 |
Basis - Natural Gas - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity |  | 507 |
Fixed Price - Electricity - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 2,775,850 |
Financial Transmission Rights - Electricity- Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 0 |
Financial Transmission Rights - Electricity- Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Volume of electricity | MWh |  | 0 |
Liquids - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Volume of derivative activity | gal | [2] | 0 |
Interest Rate - Non-current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 6,576,403,434 |
Interest Rate - Non-current Derivative Contract | Virginia Electric and Power Company |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ |  | 1,150,000,000 |
Interest Rate - Non-current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | $ | [3] | $ 550,000,000 |
Foreign Exchange - Non- Current Derivative Contract |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | 250,000,000
Foreign Exchange - Non- Current Derivative Contract | Dominion Energy Gas Holdings, LLC |  |  |
Derivative [Line Items] |  |  |
Interest rate / Foreign currency (US Dollars, Euros) | € | [3] |  | € 250,000,000
[1] | Includes options.
[2] | Includes NGLs.
[3] | Maturity is determined based on final settlement period.

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_FixedPriceNaturalGasCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_VirginiaElectricAndPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_BasisNaturalGasCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_FixedPriceElectricityCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_FinancialTransmissionRightsElectricityCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_LiquidsCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_InterestRateCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=d_DominionEnergyGasHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_ForeignExchangeCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_FixedPriceNaturalGasNoncurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_BasisNaturalGasNoncurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_FixedPriceElectricityNoncurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_FinancialTransmissionRightsElectricityNoncurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_LiquidsNoncurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_InterestRateNoncurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=d_ForeignExchangeNonCurrentDerivativeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |