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Acquisitions and Dispositions (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ 1,300 |  | $ 197 | $ 374
Benefit associated with the termination |  |  |  |  | 25
Impairment of assets and other charges |  | 307 |  | 1,401 | 194
East Ohio | Enbridge |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of goodwill | $ 50 | 50 |  |  |
Goodwill impairement after tax | 45 | 45 |  |  |
Income tax expense (benefit) |  | 69 | [1] | 45 | 38
Questar Gas and Wexpro | Enbridge |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of goodwill | 284 | 284 |  |  |
Goodwill impairement after tax | $ 279 | 279 |  |  |
Income tax expense (benefit) |  | 521 | [1] | 50 | 42
Other |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | (38) | [1] | (28) | (1)
Other | Nonregulated Solar Assets |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | 68 |  |  |
Impairment of assets and other charges after tax |  | 51 |  |  |
Other | Nonregulated Solar Generation Facility |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | 15 |  | 103 |
Impairment of assets and other charges after tax |  | 11 |  | 76 |
East Ohio, PSNC and Questar Gas |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) |  | $ (3) |  | $ (3) | 19
Gas, Transmission & Storage |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) |  |  |  |  | $ 19
[1] | Includes amounts to reflect the recognition of deferred taxes on the outside basis of the applicable entities’ stock upon meeting the classification as held for sale.

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