XML 121 R111.htm IDEA: XBRL DOCUMENT
v3.25.2

Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Parenthetical) (Detail) - USD ($) | Jul. 31, 2025 | Jun. 30, 2025 | Apr. 30, 2025 | Mar. 31, 2023
--- | --- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | $ 8,000,000,000 |  |
Virginia Electric and Power Company |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 7,000,000,000 |  |
Letter of Credit Matures in April 2032 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 3,000,000,000 |  |
Letter of Credit Matures in April 2032 | Virginia Electric and Power Company |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | 3,000,000,000 | $ 1,750,000,000 |
Letter of Credit Matures in April 2032 | Virginia Electric and Power Company | Subsequent Event |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit | $ 4,000,000,000 |  |  |
Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  |  |  | $ 100,000,000
Letter of Credit | Virginia Electric and Power Company |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Facility Limit |  | $ 3,000,000,000 |  | $ 300,000,000

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_CreditFacilityAxis=d_LetterOfCreditMaturesInApril2032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |