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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Current    
EnerBank notes receivable, net of allowance for loan losses $ 241 $ 223
Non‑current    
Total notes receivable 2,444 2,500
Consumers Energy Company    
Current    
DB SERP note receivable – related party 7 7
Non‑current    
DB SERP note receivable – related party 96 96
Total notes receivable 103 103
EnerBank    
Current    
EnerBank notes receivable, net of allowance for loan losses 241 242
Non‑current    
EnerBank notes receivable, net of allowance for loan losses 2,203 2,258
EnerBank | Receivables Excluding Held for Sale    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Deferred Income 130 134
Current    
EnerBank notes receivable, net of allowance for loan losses 241 223
EnerBank | Receivables Held for Sale    
Current    
EnerBank notes receivable, net of allowance for loan losses $ 0 $ 19