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Exit Activities and Discontinued Operations - Income from Discontinued Operations (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on sale |  | $ 5 | $ 0
Income tax expense |  | 1 | 9
Income from discontinued operations, net of tax |  | 4 | 34
Discontinued Operations, Held-for-sale | EnerBank |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Operating revenue |  | 0 | 70
Operating expenses |  | 0 | 15
Interest expense |  | 0 | 12
Income before income taxes |  | 0 | 43
Gain on sale | $ 657 | 5 | 0
Income from discontinued operations before income taxes |  | 5 | 43
Income tax expense |  | 1 | 9
Income from discontinued operations, net of tax |  | $ 4 | $ 34

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