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Regulatory Matters (Schedule of Components of the Annual Rate Increase Requested) (Details) - 2016 Electric Rate Case [Member] - Consumers Energy Company [Member]
$ in Millions
1 Months Ended
Mar. 31, 2016
USD ($)
Public Utilities, General Disclosures [Line Items]  
Annual rate increase requested $ 225
Investment In Rate Base [Member]  
Public Utilities, General Disclosures [Line Items]  
Annual rate increase requested 161
Operating And Maintenance Costs [Member]  
Public Utilities, General Disclosures [Line Items]  
Annual rate increase requested 21
Gross Margin [Member]  
Public Utilities, General Disclosures [Line Items]  
Annual rate increase requested 17
Cost Of Capital [Member]  
Public Utilities, General Disclosures [Line Items]  
Annual rate increase requested 15
Working Capital [Member]  
Public Utilities, General Disclosures [Line Items]  
Annual rate increase requested $ 11