Plant, Property, and Equipment (Schedule of Finance Leases and Other Financing Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Finance Leases and Other Financing Obligations, Rollforward [Roll Forward]
Balance at beginning of period	$ 170	$ 332
Additions	0	44
Net retirements and other adjustments	(34)	(206)
Balance at end of period	136	170
Consumers Energy Company
Finance Leases and Other Financing Obligations, Rollforward [Roll Forward]
Balance at beginning of period	146	332
Additions	0	20
Net retirements and other adjustments	(34)	(206)
Balance at end of period	$ 112	$ 146