Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities
Net income	$ 380	$ 307
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	539	514
Deferred income taxes and investment tax credits	95	60
Pension contributions	(531)	0
Other non-cash operating activities and reconciling adjustments	20	9
Cash provided by (used in) changes in assets and liabilities
Accounts and notes receivable and accrued revenue	130	190
Inventories	99	98
Accounts payable and accrued rate refunds	23	(48)
Other current and non-current assets and liabilities	41	55
Net cash provided by operating activities	796	1,185
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(946)	(973)
Increase in EnerBank notes receivable	(148)	(170)
Purchase of notes receivable by EnerBank	(15)	(220)
Cost to retire property and other investing activities	(59)	(47)
Net cash used in investing activities	(1,168)	(1,410)
Cash Flows from Financing Activities
Proceeds from issuance of debt	2,353	1,455
Retirement of debt	(392)	(1,104)
Increase in EnerBank certificates of deposit	132	371
Decrease in notes payable	(90)	(97)
Issuance of common stock, net of issuance costs	104	6
Payment of dividends on common and preferred stock	(234)	(218)
Other financing costs	(54)	(29)
Net cash provided by financing activities	1,819	384
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	1,447	159
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	157	175
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	1,604	334
Non-cash transactions
Capital expenditures not paid	167	150
Consumers Energy Company
Cash Flows from Operating Activities
Net income	395	324
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	530	506
Deferred income taxes and investment tax credits	67	41
Pension contributions	(518)	0
Other non-cash operating activities and reconciling adjustments	(4)	4
Cash provided by (used in) changes in assets and liabilities
Accounts and notes receivable and accrued revenue	158	187
Inventories	99	96
Accounts payable and accrued rate refunds	18	(41)
Other current and non-current assets and liabilities	36	(7)
Net cash provided by operating activities	781	1,110
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(936)	(963)
Cost to retire property and other investing activities	(57)	(63)
Net cash used in investing activities	(993)	(1,026)
Cash Flows from Financing Activities
Proceeds from issuance of debt	1,528	297
Retirement of debt	(363)	(528)
Decrease in notes payable	(90)	(97)
Stockholder contribution	650	675
Payment of dividends on common and preferred stock	(277)	(273)
Other financing costs	(35)	(2)
Net cash provided by financing activities	1,413	72
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	1,201	156
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	28	56
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	1,229	212
Non-cash transactions
Capital expenditures not paid	$ 157	$ 138