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Asset Sales - Schedule of Assets Held For Sale (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total assets | $ 39 | $ 0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Plant, property, and equipment, net | 34 |
Construction work in progress | 5 |
Total assets | 39 |
Consumers Energy Company |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total assets | 35 | $ 0
Consumers Energy Company | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Plant, property, and equipment, net | 30 |
Construction work in progress | 5 |
Total assets | $ 35 |

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