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