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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable $ 180 $ 128
EnerBank notes receivable held for sale 39 16
Total notes receivable 1,326 1,161
Consumers Energy Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 29  
Total notes receivable 45  
EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 219 144
Noncurrent notes receivable 1,088 1,017
Receivables, Net Of Allowance For Loan Losses [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 151 128
Receivables Held For Sale [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 39 $ 16
State Of Michigan Tax Settlement [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 29  
Noncurrent notes receivable 19  
State Of Michigan Tax Settlement [Member] | Consumers Energy Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 29  
Noncurrent notes receivable $ 16