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Exit Activities and Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 30 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2021 | Oct. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain from divestiture of business |  |  | $ 5 | $ 0 |  |
Discontinued Operations, Held-for-sale | EnerBank |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from divestiture of businesses | $ 1,000 |  |  |  |  |
Gain from divestiture of business |  | $ 657 | 5 | 0 |  |
Gain from divestiture of business related to post-closing adjustment |  |  | 6 |  |  |
Post-closing purchase price adjustment |  |  |  |  |  | $ 36
Retention Benefits | D.E. Karn Generating Complex |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Expected cost |  |  | 35 |  | $ 35 |
Retention and severance costs |  |  |  |  | 16 |
Cost deferred |  |  | $ 1 | $ 2 |  |
Retention Benefits | D.E. Karn Generating Complex | Retention Incentive Program |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Cost deferred |  |  |  |  | 8 |
Retention Benefits | D.E. Karn Generating Complex | Property, Plant and Equipment |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Costs incurred and capitalized |  |  |  |  | $ 4 |

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