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Exit Activities and Discontinued Operations - Income from Discontinued Operations (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain on sale1 |  |  |  | $ 5 | $ 0
Income tax expense |  | $ 0 | $ 7 | 1 | 16
Income from discontinued operations, net of tax |  | 0 | 18 | 4 | 52
Discontinued Operations, Held-for-sale | EnerBank |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Operating revenue |  | 0 | 69 | 0 | 139
Operating expenses |  | 0 | 28 | 0 | 43
Interest expense |  | 0 | 11 | 0 | 23
Income before income taxes |  | 0 | 30 | 0 | 73
Gain on sale1 | $ 657 | 0 | (5) | 5 | (5)
Income from discontinued operations before income taxes |  | 0 | 25 | 5 | 68
Income tax expense |  | 0 | 7 | 1 | 16
Income from discontinued operations, net of tax |  | $ 0 | $ 18 | $ 4 | $ 52

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