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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Current    
EnerBank notes receivable, net of allowance for loan losses $ 249 $ 233
Consumers Energy Company    
Current    
DB SERP note receivable – related party 7 7
Non‑current    
DB SERP note receivable – related party 98 99
Total notes receivable 105 106
EnerBank    
Current    
EnerBank notes receivable, net of allowance for loan losses 249 233
Non‑current    
EnerBank notes receivable 1,982 1,624
Total notes receivable $ 2,231 $ 1,857