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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable $ 197 $ 180
EnerBank notes receivable held for sale 31 39
Total notes receivable 1,382 1,326
Consumers Energy Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 30 29
Total notes receivable 46 45
EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Noncurrent notes receivable 1,134 1,088
Receivables, Net Of Allowance For Loan Losses [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 167 151
Receivables Held For Sale [Member] | EnerBank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
EnerBank notes receivable held for sale 31 39
Michigan Tax Settlement [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 30 29
Noncurrent notes receivable 20 19
Michigan Tax Settlement [Member] | Consumers Energy Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current notes receivable 30 29
Noncurrent notes receivable $ 16 $ 16