Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net income	$ 213	$ 241
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	298	279
Deferred income taxes and investment tax credit	43	37
Other non-cash operating activities and reconciling adjustments	16	10
Cash provided by (used in) changes in assets and liabilities
Accounts and notes receivable and accrued revenue	(61)	7
Inventories	209	228
Accounts payable and accrued rate refunds	(89)	(92)
Other current and non-current assets and liabilities	(12)	(2)
Net cash provided by operating activities	617	708
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(481)	(422)
Increase in EnerBank notes receivable	(46)	(5)
Purchase of notes receivable by EnerBank	(121)	0
Cost to retire property and other investing activities	(27)	(29)
Net cash used in investing activities	(675)	(456)
Cash Flows from Financing Activities
Proceeds from issuance of debt	993	250
Retirement of debt	(790)	(180)
Increase (decrease) in EnerBank certificates of deposit	151	(9)
Decrease in notes payable	(67)	(170)
Issuance of common stock	3	3
Payment of dividends on common stock	(108)	(101)
Payment of finance lease obligations and other financing costs	(32)	(22)
Net cash provided by (used in) financing activities	150	(229)
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	92	23
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	175	204
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	267	227
Non-cash transactions
Capital expenditures not paid	99	102
Consumers Energy Company
Cash Flows from Operating Activities
Net income	226	242
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	294	277
Deferred income taxes and investment tax credit	17	3
Other non-cash operating activities and reconciling adjustments	2	7
Cash provided by (used in) changes in assets and liabilities
Accounts and notes receivable and accrued revenue	(59)	5
Inventories	204	226
Accounts payable and accrued rate refunds	(80)	(88)
Other current and non-current assets and liabilities	15	48
Net cash provided by operating activities	619	720
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under finance lease)	(476)	(414)
Cost to retire property and other investing activities	(26)	(30)
Net cash used in investing activities	(502)	(444)
Cash Flows from Financing Activities
Retirement of debt	(215)	0
Decrease in notes payable	(67)	(170)
Stockholder contribution	350	100
Payment of dividends on common stock	(172)	(119)
Payment of finance lease obligations and other financing costs	(5)	(6)
Net cash provided by (used in) financing activities	(109)	(195)
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts	8	81
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	56	65
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	64	146
Non-cash transactions
Capital expenditures not paid	$ 85	$ 90