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Variable Interest Entities - (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Oct. 31, 2024 | Feb. 29, 2024 | Dec. 31, 2021
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents | [1] | $ 310 |  | $ 184 |  |  |  |  |
Customer receivables | [1] | 2,169 |  | 2,251 |  |  |  |  |
Regulatory assets-current | [1] | 992 |  | 1,309 |  |  |  |  |
Prepayments | [1] | 315 |  | 246 |  |  |  |  |
Property, plant and equipment |  | 68,862 |  | 58,780 |  |  |  |  |
Other current assets | [1] | 165 |  | 175 |  |  |  |  |
Regulatory assets-noncurrent | [1] | 8,288 |  | 8,356 |  |  |  |  |
Securities due within one year | [2] | 1,725 |  | 6,589 |  |  |  |  |
Other deferred charges and other assets | [1] | 1,620 |  | 1,507 |  |  |  |  |
Accrued interest, payroll and taxes | [2] | 1,045 |  | 1,075 |  |  |  |  |
Other current liabilities | [3] | 2,084 |  | 1,732 |  |  |  |  |
Long-term debt |  | 37,525 |  | 33,248 |  |  |  |  |
Asset retirement obligations | [2] | 7,074 |  | 5,641 |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 160 | [4] | 90 | [4] | $ 22 |  |  | $ 26
Customer receivables | [4] | 1,612 |  | 1,728 |  |  |  |  |
Regulatory assets-current | [4] | 697 |  | 868 |  |  |  |  |
Prepayments | [4] | 64 |  | 46 |  |  |  |  |
Property, plant and equipment |  | 52,517 |  | 43,867 |  |  |  |  |
Other current assets | [4] | 129 |  | 60 |  |  |  |  |
Regulatory assets-noncurrent | [4] | 4,537 |  | 4,317 |  |  |  |  |
Securities due within one year | [5] | 548 |  | 381 |  |  |  |  |
Other deferred charges and other assets | [4],[6] | 1,308 |  | 1,160 |  |  |  |  |
Accrued interest, payroll and taxes | [5] | 366 |  | 293 |  |  |  |  |
Other current liabilities |  | 1,228 |  | 908 |  |  |  |  |
Long-term debt |  | 20,038 |  | 17,115 |  |  |  |  |
Asset retirement obligations | [5] | $ 5,076 |  | 4,276 |  |  |  |  |
Virginia Electric and Power Company | CVOW Commercial Project |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 50.00% | 50.00% |
Variable Interest Entity Not Primary Beneficiary | Distribution | Atlantic Coast Pipeline | Pipelines | Jointly Owned Natural Gas Pipeline |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Initial membership interest percentage |  | 53.00% |  |  |  |  |  |  |
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets-current |  | $ 124 |  |  |  |  |  |  |
Other current assets |  | 41 |  |  |  |  |  |  |
Regulatory assets-noncurrent |  | 1,000 |  |  |  |  |  |  |
Securities due within one year |  | 163 |  |  |  |  |  |  |
Accrued interest, payroll and taxes |  | 10 |  |  |  |  |  |  |
Long-term debt |  | 1,100 |  |  |  |  |  |  |
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Shared Services Purchased |  | 494 |  | 463 |  | $ 396 |  |  |
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Other current liabilities |  | 38 |  | $ 32 |  |  |  |  |
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | Maximum |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Prepayments |  | 1 |  |  |  |  |  |  |
Other deferred charges and other assets |  | 1 |  |  |  |  |  |  |
Variable Interest Entity Not Primary Beneficiary | OSWP |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 70 |  |  |  |  |  |  |
Regulatory assets-current |  | 6 |  |  |  |  |  |  |
Prepayments |  | 10 |  |  |  |  |  |  |
Property, plant and equipment |  | 5,800 |  |  |  |  |  |  |
Regulatory assets-noncurrent |  | 52 |  |  |  |  |  |  |
Asset retirement obligations |  | 38 |  |  |  |  |  |  |
Variable Interest Entity Not Primary Beneficiary | OSWP | Maximum |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |
Customer receivables |  | 1 |  |  |  |  |  |  |
Accrued interest, payroll and taxes |  | $ 1 |  |  |  |  |  |  |
[1] | See Note 16 for amounts attributable to VIEs.
[2] | See Note 16 for amounts attributable to VIEs.
[3] | See Note 9 for amounts attributable to related parties.
[4] | See Note 16 for amounts attributable to VIEs.
[5] | See Note 16 for amounts attributable to VIEs.
[6] | See Note 25 for amounts attributable to affiliates.

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