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Income Taxes (Loss And Credit Carryforwards) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Operating Loss Carryforwards [Line Items] |
General business credits | $ 206
Alternative minimum tax credits | 29
Total tax attributes | 239
Consumers Energy Company |
Operating Loss Carryforwards [Line Items] |
Total tax attributes | 20
Local Tax Authority |
Operating Loss Carryforwards [Line Items] |
Local net operating loss carryforwards | 389
Local net operating loss carryforwards | 4
General business credits |
Operating Loss Carryforwards [Line Items] |
Tax credits | 206
General business credits | Consumers Energy Company |
Operating Loss Carryforwards [Line Items] |
Tax credits | 20
General business credits | 20
Alternative minimum tax credits |
Operating Loss Carryforwards [Line Items] |
Tax credits | $ 29

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