Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities
Net Income	$ 342	$ 243
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	340	316
Deferred income taxes and investment tax credits	48	67
Other non‑cash operating activities and reconciling adjustments	(17)	9
Pension contributions	0	(531)
Changes in assets and liabilities
Accounts and notes receivable and accrued revenue	30	(17)
Inventories	168	171
Accounts payable and accrued rate refunds	(103)	(54)
Other current and non‑current assets and liabilities	24	(3)
Net cash provided by operating activities	832	201
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(437)	(523)
Increase in EnerBank notes receivable	(76)	(4)
Purchase of notes receivable by EnerBank	(2)	(8)
Proceeds from sale of EnerBank notes receivable	263	0
Cost to retire property and other investing activities	(31)	(24)
Net cash used in investing activities	(283)	(559)
Cash Flows from Financing Activities
Proceeds from issuance of debt	0	1,198
Retirement of debt	(2)	(2)
Decrease in EnerBank certificates of deposit	(73)	(7)
Decrease in notes payable	0	(90)
Issuance of common stock, net of issuance costs	9	101
Payment of dividends on common stock	(126)	(116)
Other financing costs	(18)	(22)
Net cash provided by (used in) financing activities	(210)	1,062
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	339	704
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	185	157
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	524	861
Non‑cash transactions
Capital expenditures not paid	87	95
Consumers Energy Company
Cash Flows from Operating Activities
Net Income	336	235
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	329	312
Deferred income taxes and investment tax credits	51	44
Other non‑cash operating activities and reconciling adjustments	(10)	0
Pension contributions	0	(518)
Changes in assets and liabilities
Accounts and notes receivable and accrued revenue	39	31
Inventories	168	170
Accounts payable and accrued rate refunds	(99)	(54)
Other current and non‑current assets and liabilities	27	18
Net cash provided by operating activities	841	238
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(433)	(520)
Cost to retire property and other investing activities	(25)	(22)
Net cash used in investing activities	(458)	(542)
Cash Flows from Financing Activities
Proceeds from issuance of debt	0	873
Decrease in notes payable	0	(90)
Decrease in notes payable – related parties	(250)	0
Stockholder contribution	150	350
Payment of dividends on common stock	(276)	(219)
Other financing costs	(8)	(10)
Net cash provided by (used in) financing activities	(384)	904
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	(1)	600
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	35	28
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	34	628
Non‑cash transactions
Capital expenditures not paid	$ 84	$ 85