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Significant Accounting Policies (Narrative) (Detail 2) - USD ($) | 1 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Feb. 29, 2024 | Apr. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Finite Lived Intangible Asset Useful Life |  |  | 35 years |  | 35 years |
Impairment of goodwill |  |  | $ 0 |  |  |
Impairment of Assets and Other Charges |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Inventory balances wrote off |  |  |  | $ 40,000,000 |  |
Inventory balances wrote off, after tax |  |  |  | 30,000,000 |  |
Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease extend term |  |  | 1 year |  | 1 year |
Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Lease extend term |  |  | 70 years |  | 70 years |
Virginia Electric and Power Company |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Finite Lived Intangible Asset Useful Life |  |  | 35 years |  | 35 years |
Virginia Electric and Power Company | Biennial Review |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Authorized return percentage | 70.00% | 9.35% |  |  | 9.70% |
Virginia Electric and Power Company | Triennial Review |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Authorized return percentage |  | 70.00% |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Inventory balances wrote off |  |  |  | 19,000,000 |  |
Inventory balances wrote off, after tax |  |  |  | $ 14,000,000 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Inventory under LIFO method |  |  |  |  |  | $ 18,000,000
Amount exceeded on LIFO basis |  |  |  |  |  | $ 42,000,000

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- Definition The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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