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Income Taxes (Summary of Loss and Credit Carryforwards) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Operating Loss Carryforwards [Line Items]  
General business credits $ 356
Total tax attributes 428
Consumers Energy Company  
Operating Loss Carryforwards [Line Items]  
General business credits 122
Total tax attributes 175
State Tax Authority  
Operating Loss Carryforwards [Line Items]  
Local net operating loss carryforwards 69
State Tax Authority | Consumers Energy Company  
Operating Loss Carryforwards [Line Items]  
Local net operating loss carryforwards 53
Local Tax Authority  
Operating Loss Carryforwards [Line Items]  
Local net operating loss carryforwards $ 3