Cash and Cash Equivalents (Schedule Of Cash And Cash Equivalents, Including Restricted Amounts) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 168	$ 452
Restricted cash and cash equivalents	27	24
Cash and cash equivalents, including restricted amounts	195	476	$ 236	$ 185
Consumers Energy Company
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	83	22
Restricted cash and cash equivalents	27	22
Cash and cash equivalents, including restricted amounts	$ 110	$ 44	$ 55	$ 35