XML 26 R91.htm IDEA: XBRL DOCUMENT
v3.20.1

Investments (Equity and Fixed Income Securities, Insurance Contracts and Cash Equivalents in Decommissioning Trust Funds) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Fair Value |  | $ 1,747 |  |
Amortized Cost, Total |  | 3,715 |  | $ 3,691
Total Unrealized Gains |  | 1,784 |  | 2,523
Total Unrealized Losses | [1] | (165) |  | (22)
Allowance for Credit Losses, Total |  | (21) |  |
Fair Value, Total |  | 5,313 |  | 6,192
Fair value of securities in an unrealized loss position |  | 415 |  | 298
Net assets related to pending sales and purchases of securities |  | 12 |  | 1
Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Fair Value |  | 852 |  |
Amortized Cost, Total |  | 1,737 |  | 1,721
Total Unrealized Gains |  | 823 |  | 1,173
Total Unrealized Losses | [2] | (80) |  | (13)
Allowance for Credit Losses, Total |  | (12) |  |
Fair Value, Total |  | 2,468 |  | 2,881
Fair value of securities in an unrealized loss position |  | 241 |  | 185
Net assets related to pending sales and purchases of securities |  | 2 |  |
Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other Amortized Cost | [3] |  |  | 13
Cash equivalents and other Fair Value | [3] | (4) |  | 13
Common/collective trust funds | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 118 |  | 115
Fixed income securities Total Unrealized Gains | [4] | 2 |  | 4
Fixed income securities Allowance for Credit Losses | [4] | (2) |  |
Fixed income securities Fair Value | [4] | 118 |  | 119
Common/collective trust funds | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 49 |  | 51
Fixed income securities Fair Value | [4] | 49 |  | 51
Equity securities: | U.S. |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [5] | 1,813 |  | 1,807
Equity securities Total Unrealized Gains | [5] | 1,709 |  | 2,451
Equity securities Total Unrealized Losses | [5] | (161) |  | (20)
Equity securities Fair Value | [5] | 3,361 |  | 4,238
Equity securities: | U.S. | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Equity securities Amortized Cost | [5] | 898 |  | 894
Equity securities Total Unrealized Gains | [5] | 796 |  | 1,144
Equity securities Total Unrealized Losses | [5] | (80) |  | (11)
Equity securities Fair Value | [5] | 1,614 |  | 2,027
Corporate debt instruments | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 491 |  | 434
Fixed income securities Total Unrealized Gains | [4] | 18 |  | 29
Fixed income securities Allowance for Credit Losses | [4] | (13) |  |
Fixed income securities Fair Value | [4] | 496 |  | 463
Corporate debt instruments | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 284 |  | 241
Fixed income securities Total Unrealized Gains | [4] | 9 |  | 15
Fixed income securities Allowance for Credit Losses | [4] | (8) |  |
Fixed income securities Fair Value | [4] | 285 |  | 256
Government Securities | Fixed Income |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 1,084 |  | 1,108
Fixed income securities Total Unrealized Gains | [4] | 55 |  | 39
Fixed income securities Total Unrealized Losses | [4] |  |  | (2)
Fixed income securities Allowance for Credit Losses | [4] | (6) |  |
Fixed income securities Fair Value | [4] | 1,133 |  | 1,145
Government Securities | Fixed Income | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total | [4] | 504 |  | 534
Fixed income securities Total Unrealized Gains | [4] | 18 |  | 14
Fixed income securities Total Unrealized Losses | [4] |  |  | (2)
Fixed income securities Allowance for Credit Losses | [4] | (4) |  |
Fixed income securities Fair Value | [4] | 518 |  | 546
Insurance Contracts |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Fixed income securities Amortized Cost, Total |  | 209 |  | 214
Fixed income securities Fair Value |  | 209 |  | 214
Cash equivalents and other | Virginia Electric and Power Company |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Cash equivalents and other Amortized Cost |  | 2 | [6] | 1
Cash equivalents and other Fair Value |  | $ 2 | [6] | $ 1
[1] | The fair value of securities in an unrealized loss position was $415 million and $298 million at March 31, 2020 and December 31, 2019, respectively.
[2] | The fair value of securities in an unrealized loss position was $241 million and $185 million at March 31, 2020 and December 31, 2019, respectively.
[3] | Includes pending purchases of securities of $12 million and $1 million at March 31, 2020 and December 31, 2019, respectively
[4] | Unrealized gains and losses on fixed income securities are included in AOCI and the nuclear decommissioning trust regulatory liability. Effective January 2020, changes in allowance for credit losses are included in other income (expense).
[5] | Unrealized gains and losses on equity securities are included in other income and the nuclear decommissioning trust regulatory liability.
[6] | Includes pending sales of securities of $2 million at March 31, 2020.

X
- Definition Available for sale securities amortized cost basis and other investments. + References No definition available. + Details
Name: | d_AvailableForSaleSecuritiesAmortizedCostBasisAndOtherInvestments
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash equivalents and other carrying value. + References No definition available. + Details
Name: | d_CashEquivalentsAndOtherCarryingValue
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash equivalents and other fair value. + References No definition available. + Details
Name: | d_CashEquivalentsAndOtherFairValue
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Decommissioning fund investments net. + References No definition available. + Details
Name: | d_DecommissioningFundInvestmentsNet
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Decommissioning trust securities allowance for credit losses. + References No definition available. + Details
Name: | d_DecommissioningTrustSecuritiesAllowanceForCreditLosses
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Decommissioning trust securities unrealized gains. + References No definition available. + Details
Name: | d_DecommissioningTrustSecuritiesUnrealizedGains
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Decommissioning trust securities unrealized losses. + References No definition available. + Details
Name: | d_DecommissioningTrustSecuritiesUnrealizedLosses
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents net assets (liabilities) of pending sales (purchases) of investment securities. + References No definition available. + Details
Name: | d_NetAssetsLiabilitiesOfPendingSalesPurchasesOfInvestmentSecurities
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesGrossUnrealizedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
Name: | us-gaap_EquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value. + References No definition available. + Details
Name: | us-gaap_EquitySecuritiesFvNiCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
Name: | us-gaap_EquitySecuritiesFvNiUnrealizedGain
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714 + Details
Name: | us-gaap_EquitySecuritiesFvNiUnrealizedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_InvestmentHoldingsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_TrustForBenefitOfEmployeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=d_GovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=d_InsuranceContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=d_CashEquivalentsAndOtherInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |