Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities
Net Income	$ 696	$ 590
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	832	763
Deferred income taxes and investment tax credits	110	140
Other non‑cash operating activities and reconciling adjustments	(71)	(22)
Pension contributions	0	(531)
Net cash provided by (used in) discontinued operations	(111)	35
Changes in assets and liabilities
Accounts receivable and accrued revenue	129	221
Inventories	(185)	(34)
Accounts payable and accrued rate refunds	84	30
Other current assets and liabilities	(30)	(91)
Other non‑current assets and liabilities	29	43
Net cash provided by operating activities	1,483	1,144
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(1,442)	(1,693)
Net cash provided by (used in) discontinued operations	78	(505)
Cost to retire property and other investing activities	(96)	(100)
Net cash used in investing activities	(1,460)	(2,298)
Cash Flows from Financing Activities
Proceeds from issuance of debt	300	2,353
Retirement of debt	(18)	(1,294)
Decrease in notes payable	0	(90)
Issuance of common stock, net of issuance costs	23	107
Issuance of preferred stock, net of issuance costs	224	0
Payment of dividends on common and preferred stock	(380)	(351)
Proceeds from the sale of membership interest in VIE to tax equity investor	0	417
Contribution from noncontrolling interest	1	31
Net cash provided by (used in) discontinued operations	(84)	456
Other financing costs	(38)	(74)
Net cash provided by financing activities	28	1,555
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	51	401
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	185	157
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	236	558
Non‑cash transactions
Capital expenditures not paid	172	140
Consumers Energy Company
Cash Flows from Operating Activities
Net Income	712	625
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	804	753
Deferred income taxes and investment tax credits	129	136
Other non‑cash operating activities and reconciling adjustments	(65)	(21)
Pension contributions	0	(518)
Changes in assets and liabilities
Accounts receivable and accrued revenue	137	190
Inventories	(186)	(34)
Accounts payable and accrued rate refunds	60	29
Other current assets and liabilities	(24)	(103)
Other non‑current assets and liabilities	16	28
Net cash provided by operating activities	1,583	1,085
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(1,433)	(1,595)
Cost to retire property and other investing activities	(86)	(105)
Net cash used in investing activities	(1,519)	(1,700)
Cash Flows from Financing Activities
Proceeds from issuance of debt	300	1,528
Retirement of debt	(13)	(773)
Decrease in notes payable	0	(90)
Decrease in notes payable – related parties	(307)	0
Stockholder contribution	575	650
Payment of dividends on common and preferred stock	(571)	(450)
Other financing costs	(28)	(55)
Net cash provided by financing activities	(44)	810
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	20	195
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	35	28
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	55	223
Non‑cash transactions
Capital expenditures not paid	$ 168	$ 156