Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current
Current notes receivable	$ 223	$ 233
Non‑current
Total notes receivable	2,500	1,857
Consumers Energy Company
Current
DB SERP note receivable – related party	7	7
Non‑current
Accounts and notes receivable – related parties	96	99
Total notes receivable	103	106
EnerBank
Current
Current notes receivable	242	233
Non‑current
Notes receivable	2,258	1,624
EnerBank | EnerBank notes receivable, net of allowance for loan losses
Current
Current notes receivable	223	233
EnerBank | EnerBank notes receivable held for sale
Current
Current notes receivable	$ 19	$ 0