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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | $ 183 | $ 195 | $ 412 | $ 469
Income tax (benefit) expense from discontinued operations | (10) | 1,200 | 22 | 1,300
Cove Point |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax (benefit) expense from discontinued operations |  | 7 |  | 31
East Ohio, PSNC and Questar Gas |  |  |  |
Income Taxes [Line Items] |  |  |  |
Discontinued operations, deferred tax liabilities | $ 825 |  | $ 825 |
East Ohio, PSNC and Questar Gas | Cove Point |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) |  |  |  | 29
Ownership percentage | 50.00% |  | 50.00% |
East Ohio, Questar Gas and PSNC Transactions |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) |  |  | $ 52 |
Discontinued operations, deferred tax liabilities | $ 841 |  | 841 |
Virginia Electric and Power Company |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) | $ 141 | $ 128 | 386 | $ 311
Production tax credit |  |  | $ 53 |

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