Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current
EnerBank notes receivable, net of allowance for loan losses	$ 272	$ 242
Non‑current
Total notes receivable	2,907	2,500
Consumers Energy Company
Current
DB SERP note receivable – related party	7	7
Non‑current
DB SERP note receivable – related party	101	96
Total notes receivable	108	103
EnerBank
Current
EnerBank notes receivable, net of allowance for loan losses	272	242
Non‑current
EnerBank notes receivable, net of allowance for loan losses	$ 2,635	$ 2,258