Variable Interest Entities - Schedule of Balance Sheet Included Balances for VPFS and OSWP (Detail) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Assets | ||||||||||||||||||||||||
| Cash and cash equivalents | [1] | $ 296 | $ 250 | [2] | ||||||||||||||||||||
| Prepayments | [1] | 539 | 377 | [2] | ||||||||||||||||||||
| Other receivables | [1],[3] | 301 | 446 | [2] | ||||||||||||||||||||
| Regulatory assets-current | [1] | 2,125 | 1,380 | [2] | ||||||||||||||||||||
| Other current assets | [1] | 482 | 361 | [2] | ||||||||||||||||||||
| Property, plant and equipment | 81,738 | 78,967 | [2] | |||||||||||||||||||||
| Accumulated depreciation and amortization | [1] | (28,175) | (27,348) | [2] | ||||||||||||||||||||
| Regulatory assets-noncurrent | [1] | 8,465 | 8,276 | [2] | ||||||||||||||||||||
| Other deferred charges and other assets | [1] | 7,409 | 6,724 | [2] | ||||||||||||||||||||
| Total assets | 121,891 | 115,857 | [2] | |||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Securities due within one year | [1] | 4,043 | 2,409 | [2] | ||||||||||||||||||||
| Accounts payable | [1] | 1,242 | 1,338 | [2] | ||||||||||||||||||||
| Accrued interest, payroll and taxes | [1] | 1,099 | 1,244 | [2] | ||||||||||||||||||||
| Other current liabilities | [1],[3] | 2,219 | 2,454 | [2] | ||||||||||||||||||||
| Securitization bonds | 46,719 | 44,075 | [2] | |||||||||||||||||||||
| Other deferred credits and other liabilities | 10,297 | 9,373 | [1],[2] | |||||||||||||||||||||
| Total liabilities | 88,280 | 82,440 | [2] | |||||||||||||||||||||
| Virginia Electric and Power Company | ||||||||||||||||||||||||
| Assets | ||||||||||||||||||||||||
| Cash and cash equivalents | 193 | [4] | 170 | [4],[5] | $ 157 | $ 160 | ||||||||||||||||||
| Other receivables | [4] | 193 | 252 | [5] | ||||||||||||||||||||
| Regulatory assets-current | [4] | 1,670 | 1,110 | [5] | ||||||||||||||||||||
| Other current assets | [4] | 153 | 166 | [5] | ||||||||||||||||||||
| Property, plant and equipment | 64,357 | 60,964 | [5] | |||||||||||||||||||||
| Accumulated depreciation and amortization | (19,763) | [4] | (19,157) | [5] | ||||||||||||||||||||
| Regulatory assets-noncurrent | [4] | 4,583 | 4,526 | [5] | ||||||||||||||||||||
| Other deferred charges and other assets | [4],[6] | 4,197 | 3,760 | [5] | ||||||||||||||||||||
| Total assets | 84,551 | 79,243 | [5] | |||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Securities due within one year | [4] | 1,967 | 1,366 | [5] | ||||||||||||||||||||
| Accounts payable | [4] | 824 | 821 | [5] | ||||||||||||||||||||
| Accrued interest, payroll and taxes | [4] | 483 | 450 | [5] | ||||||||||||||||||||
| Other current liabilities | [4],[6] | 1,705 | 1,900 | [5] | ||||||||||||||||||||
| Securitization bonds | 22,425 | 21,728 | [5] | |||||||||||||||||||||
| Other deferred credits and other liabilities | [4],[6] | 7,777 | 6,934 | [5] | ||||||||||||||||||||
| Total liabilities | 50,989 | 47,704 | [5] | |||||||||||||||||||||
| Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | ||||||||||||||||||||||||
| Assets | ||||||||||||||||||||||||
| Prepayments | [7] | 1 | 1 | |||||||||||||||||||||
| Regulatory assets-current | 133 | 125 | ||||||||||||||||||||||
| Other current assets | [8] | 45 | 51 | |||||||||||||||||||||
| Regulatory assets-noncurrent | 779 | 868 | ||||||||||||||||||||||
| Total assets | 958 | 1,045 | ||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Securities due within one year | 176 | 171 | ||||||||||||||||||||||
| Accrued interest, payroll and taxes | 8 | 9 | ||||||||||||||||||||||
| Securitization bonds | 794 | 883 | ||||||||||||||||||||||
| Total liabilities | 978 | 1,063 | ||||||||||||||||||||||
| Variable Interest Entity Not Primary Beneficiary | OSWP | ||||||||||||||||||||||||
| Assets | ||||||||||||||||||||||||
| Cash and cash equivalents | 162 | 149 | ||||||||||||||||||||||
| Other receivables | 101 | 0 | ||||||||||||||||||||||
| Regulatory assets-current | 5 | 15 | ||||||||||||||||||||||
| Other investments | 1 | 0 | ||||||||||||||||||||||
| Property, plant and equipment | 9,234 | 8,799 | ||||||||||||||||||||||
| Accumulated depreciation and amortization | (20) | 0 | ||||||||||||||||||||||
| Regulatory assets-noncurrent | 269 | 150 | ||||||||||||||||||||||
| Other deferred charges and other assets | 23 | 9 | ||||||||||||||||||||||
| Total assets | 9,775 | 9,122 | ||||||||||||||||||||||
| Liabilities | ||||||||||||||||||||||||
| Accounts payable | 3 | 2 | ||||||||||||||||||||||
| Accrued interest, payroll and taxes | 4 | 2 | ||||||||||||||||||||||
| Other current liabilities | 20 | 16 | ||||||||||||||||||||||
| Asset retirement obligations - noncurrent | [9] | 429 | 220 | |||||||||||||||||||||
| Total liabilities | $ 456 | $ 240 | ||||||||||||||||||||||
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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- Definition Amount of long-term debt and lease obligation, classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of long-term debt and lease obligation, classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of current assets classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of noncurrent assets classified as other. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investments classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer. No definition available.
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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