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Exit Activities and Discontinued Operations - Income from Discontinued Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income tax expense | $ 9 | $ 4 | $ 25 | $ 10
Income from discontinued operations, net of tax | 30 | 12 | 82 | 34
Discontinued Operations, Held-for-sale | EnerBank |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Operating revenue | 70 | 68 | 209 | 191
Operating expenses | 17 | 39 | 60 | 104
Interest expense | 11 | 13 | 34 | 43
Income before income taxes | 42 | 16 | 115 | 44
Transaction costs | (3) | 0 | (8) | 0
Income from discontinued operations before income taxes | 39 | 16 | 107 | 44
Income tax expense | 9 | 4 | 25 | 10
Income from discontinued operations, net of tax | $ 30 | $ 12 | $ 82 | $ 34

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