Consumers Energy Company Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities
Net Income	$ 1,003	$ 887	$ 837
Adjustments to reconcile net income to net cash provided by operating activities
Deferred income taxes and investment tax credits	142	157	89
Bad debt expense	33	34	50
Postretirement benefits contributions	(13)	(12)	(12)
Other non‑cash operating activities and reconciling adjustments	(241)	(274)	(93)
Changes in assets and liabilities
Accounts receivable and accrued revenue	(155)	241	(677)
Inventories	164	185	(450)
Accounts payable and accrued rate refunds	15	(136)	4
Other current assets and liabilities	42	(21)	14
Other non‑current assets and liabilities	196	147	(4)
Net cash provided by operating activities	2,370	2,309	855
Cash Flows from Investing Activities
Cost to retire property and other investing activities	(160)	(167)	(107)
Net cash used in investing activities	(3,054)	(3,386)	(2,476)
Cash Flows from Financing Activities
Proceeds from issuance of debt	1,962	3,551	1,899
Retirement of debt	(952)	(2,132)	(106)
Increase (decrease) in notes payable	(28)	73	20
Other financing costs	(21)	(42)	(58)
Net cash provided by financing activities	614	1,143	1,327
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	(70)	66	(294)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	248	182	476
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	178	248	182
Cash transactions
Interest paid (net of amounts capitalized)	677	607	490
Income taxes paid (proceeds from sale of renewable energy tax credits), net	(69)	15	1
Non‑cash transactions
Capital expenditures not paid	517	265	228
ASP gain
Cash Flows from Investing Activities
Proceeds from sale of ASP business	124	0	0
Capital Expenditures
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(3,018)	(2,407)	(2,374)
Covert Plant Acquisition
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	0	(812)	0
Consumers Energy Company
Cash Flows from Operating Activities
Net Income	1,009	867	945
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	1,191	1,137	1,088
Deferred income taxes and investment tax credits	115	156	134
Bad debt expense	33	34	50
Postretirement benefits contributions	(9)	(9)	(9)
Other non‑cash operating activities and reconciling adjustments	(137)	(123)	(87)
Changes in assets and liabilities
Accounts receivable and accrued revenue	(153)	219	(660)
Inventories	164	186	(447)
Accounts payable and accrued rate refunds	19	(127)	(9)
Other current assets and liabilities	75	(35)	18
Other non‑current assets and liabilities	139	125	(29)
Net cash provided by operating activities	2,446	2,430	994
Cash Flows from Investing Activities
Cost to retire property and other investing activities	(154)	(141)	(105)
Net cash used in investing activities	(2,872)	(3,201)	(2,344)
Cash Flows from Financing Activities
Proceeds from issuance of debt	1,297	2,666	1,799
Retirement of debt	(389)	(1,654)	(28)
Stockholder contribution	735	475	685
Return of stockholder contribution	(320)	0	0
Payment of dividends on common and preferred stock	(797)	(697)	(771)
Other financing costs	(9)	(21)	(22)
Net cash provided by financing activities	489	767	1,366
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	63	(4)	16
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	56	60	44
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	119	56	60
Cash transactions
Interest paid (net of amounts capitalized)	484	417	309
Income taxes paid (proceeds from sale of renewable energy tax credits), net	(19)	31	(2)
Non‑cash transactions
Capital expenditures not paid	395	264	210
Consumers Energy Company | Nonrelated Party
Cash Flows from Financing Activities
Increase (decrease) in notes payable	(28)	73	20
Consumers Energy Company | Related Party
Cash Flows from Financing Activities
Increase (decrease) in notes payable	0	(75)	(317)
Consumers Energy Company | ASP gain
Cash Flows from Investing Activities
Proceeds from sale of ASP business	124	0	0
Consumers Energy Company | Capital Expenditures
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(2,842)	(2,248)	(2,239)
Consumers Energy Company | Covert Plant Acquisition
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	$ 0	$ (812)	$ 0