Plant, Property, and Equipment (Schedule Of Depreciation And Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation expense – plant, property, and equipment	$ 990	$ 975	$ 901
Total depreciation and amortization expense	1,126	1,114	1,043
Securitized regulatory assets
Property, Plant and Equipment [Line Items]
Amortization expense	28	27	26
Software
Property, Plant and Equipment [Line Items]
Amortization expense	103	108	112
Other intangible assets
Property, Plant and Equipment [Line Items]
Amortization expense	5	4	4
Consumers Energy Company
Property, Plant and Equipment [Line Items]
Depreciation expense – plant, property, and equipment	952	938	881
Total depreciation and amortization expense	1,088	1,077	1,023
Consumers Energy Company | Securitized regulatory assets
Property, Plant and Equipment [Line Items]
Amortization expense	28	27	26
Consumers Energy Company | Software
Property, Plant and Equipment [Line Items]
Amortization expense	103	108	112
Consumers Energy Company | Other intangible assets
Property, Plant and Equipment [Line Items]
Amortization expense	$ 5	$ 4	$ 4