Consumers Energy Company Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities
Net Income	$ 887	$ 837	$ 1,353
Adjustments to reconcile net income to net cash provided by operating activities
Deferred income taxes and investment tax credits	157	89	249
Bad debt expense	34	50	22
Postretirement benefits contributions	(12)	(12)	(12)
Other non‑cash operating activities and reconciling adjustments	(274)	(93)	(70)
Changes in assets and liabilities
Accounts receivable and accrued revenue	241	(677)	(103)
Inventories	185	(450)	(93)
Accounts payable and accrued rate refunds	(136)	4	153
Other current assets and liabilities	(21)	14	13
Other non‑current assets and liabilities	147	(4)	(16)
Net cash provided by operating activities	2,309	855	1,819
Cash Flows from Investing Activities
Cost to retire property and other investing activities	(167)	(107)	(133)
Net cash used in investing activities	(3,386)	(2,476)	(1,233)
Cash Flows from Financing Activities
Proceeds from issuance of debt	3,551	1,899	335
Retirement of debt	(2,132)	(106)	(235)
Increase in notes payable	73	20	0
Other financing costs	(54)	(62)	(54)
Net cash provided by (used in) financing activities	1,143	1,327	(295)
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	66	(294)	291
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	182	476	185
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	248	182	476
Cash transactions
Interest paid (net of amounts capitalized)	607	490	489
Income taxes paid	15	1	16
Non‑cash transactions
Capital expenditures not paid	265	228	196
Capital Expenditures
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(2,407)	(2,374)	(2,076)
Covert Plant Acquisition
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(812)	0	0
Consumers Energy Company
Cash Flows from Operating Activities
Net Income	867	945	868
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	1,137	1,088	1,077
Deferred income taxes and investment tax credits	156	134	154
Bad debt expense	34	50	22
Postretirement benefits contributions	(9)	(9)	(9)
Other non‑cash operating activities and reconciling adjustments	(123)	(87)	(64)
Changes in assets and liabilities
Accounts receivable and accrued revenue	219	(660)	(103)
Inventories	186	(447)	(90)
Accounts payable and accrued rate refunds	(127)	(9)	140
Other current assets and liabilities	(35)	18	27
Other non‑current assets and liabilities	125	(29)	(40)
Net cash provided by operating activities	2,430	994	1,982
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)			(2,052)
Cost to retire property and other investing activities	(141)	(105)	(133)
Net cash used in investing activities	(3,201)	(2,344)	(2,185)
Cash Flows from Financing Activities
Proceeds from issuance of debt	2,666	1,799	335
Retirement of debt	(1,654)	(28)	(27)
Stockholder contribution	475	685	575
Payment of dividends on common and preferred stock	(697)	(771)	(724)
Other financing costs	(21)	(22)	(32)
Net cash provided by (used in) financing activities	767	1,366	212
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	(4)	16	9
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	60	44	35
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	56	60	44
Cash transactions
Interest paid (net of amounts capitalized)	417	309	298
Income taxes paid	31	(2)	(10)
Non‑cash transactions
Capital expenditures not paid	264	210	192
Consumers Energy Company | Capital Expenditures
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(2,248)	(2,239)
Consumers Energy Company | Covert Plant Acquisition
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(812)	0	0
Consumers Energy Company | Nonrelated Party
Cash Flows from Financing Activities
Increase in notes payable	73	20	0
Consumers Energy Company | Related Party
Cash Flows from Financing Activities
Increase in notes payable	$ (75)	$ (317)	$ 85