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Significant Accounting Policies - Schedule of Capitalized to Property Plant and Equipment for Capitalized Interest Costs and AFUDC (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Capitalized interest costs and AFUDC debt |  | $ 152 | $ 109 | $ 43
AFUDC equity | [1] | 109 | 50 | 41
Virginia Power |  |  |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |  |  |
Capitalized interest costs and AFUDC debt |  | 46 | 47 | 27
AFUDC equity | [1] | $ 96 | $ 39 | $ 39
[1] | The Companies include AFUDC equity in other adjustments within operating activities in their Consolidated Statements of Cash Flows.

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- Definition The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478698/980-835-25-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479123/980-835-45-1 + Details
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- 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
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