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Acquisitions and Dispositions - (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Income tax expense (benefit) | $ 1,200 |  | $ 53 | $ 1,300 | $ 185
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) | $ 6 |  | $ 20 | $ 2 | $ 7
East Ohio, PSNC and Questar Gas | Impairment of Assets and Other Charges |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | $ 15 |  |  |
Impairment of assets and other charges after tax |  | $ 11 |  |  |

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