Plant, Property, and Equipment (Schedule of Finance Leases and Other Financing Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Finance Leases and Other Financing Obligations, Rollforward [Roll Forward]
Balance at beginning of period	$ 136	$ 170
Additions	55	0
Net retirements and other adjustments	(15)	(34)
Balance at end of period	176	136
Consumers Energy Company
Finance Leases and Other Financing Obligations, Rollforward [Roll Forward]
Balance at beginning of period	112	146
Additions	34	0
Net retirements and other adjustments	(15)	(34)
Balance at end of period	$ 131	$ 112