Plant, Property, and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Plant, property, and equipment, gross	$ 33,135	$ 30,491		$ 29,893
Assets under finance leases	136	170		332
Construction work in progress	944	1,182
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(9,007)	(8,960)
Total plant, property, and equipment	25,072	22,713
Regulatory assets	3,683	3,595
Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Plant, property, and equipment, gross	31,723	29,342		28,771
Assets under finance leases	112	146		$ 332
Construction work in progress	845	994
Accumulated depreciation and amortization	(8,796)	(8,791)
Total plant, property, and equipment	23,772	21,545
Plant additions	3,100	2,300
Plant retirements	856	290
Regulatory assets	$ 3,683	3,595
Consumers Energy Company | J.H. Campbell Generating Units
Public Utility, Property, Plant and Equipment [Line Items]
Regulatory assets			$ 1,300
Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, consumers	3 years
Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, consumers	125 years
Generation | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Generation	$ 6,511	5,780
Generation | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, generation	15 years
Generation | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, generation	125 years
Distribution | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Distribution	$ 11,339	10,590
Distribution | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, distribution	15 years
Distribution | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, distribution	75 years
Other | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Other	$ 1,355	1,374
Other | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	5 years
Other | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	55 years
Assets under finance leases | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Assets under finance leases	$ 97	126
Distribution | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Distribution	$ 7,452	6,951
Distribution | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, distribution	20 years
Distribution | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, distribution	85 years
Transmission | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	$ 2,806	2,440
Transmission | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, transmission	17 years
Transmission | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, transmission	75 years
Underground storage facilities | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Other	$ 1,295	1,197
Underground storage facilities | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	27 years
Underground storage facilities | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	75 years
Other | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Other	$ 815	835
Other | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	5 years
Other | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	55 years
Finance leases | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Assets under finance leases	$ 15	20
Other non-utility property | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Other non-utility property	$ 38	29
Other non-utility property | Consumers Energy Company | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	3 years
Other non-utility property | Consumers Energy Company | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, other	51 years
Natural Gas | Underground storage facilities | Consumers Energy Company
Public Utility, Property, Plant and Equipment [Line Items]
Other	$ 26
NorthStar Clean Energy
Public Utility, Property, Plant and Equipment [Line Items]
Assets under finance leases	24	24
Independent power production
Public Utility, Property, Plant and Equipment [Line Items]
Plant, property, and equipment, gross	$ 1,387	1,124
Independent power production | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, Enterprises	3 years
Independent power production | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, Enterprises	40 years
Other
Public Utility, Property, Plant and Equipment [Line Items]
Plant, property, and equipment, gross	$ 1	$ 1
Other | Minimum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, Enterprises	3 years
Other | Maximum
Public Utility, Property, Plant and Equipment [Line Items]
Estimated depreciable life in years, Enterprises	5 years