Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities
Net income	$ 550	$ 464
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	689	652
Deferred income taxes and investment tax credit	90	198
Other non-cash operating activities and reconciling adjustments	47	78
Cash provided by (used in) changes in assets and liabilities
Accounts and notes receivable and accrued revenue	299	185
Inventories	(76)	(161)
Accounts payable and accrued refunds	(46)	(6)
Other current and non-current assets and liabilities	12	(211)
Net cash provided by operating activities	1,565	1,199
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under capital lease)	(1,572)	(1,208)
Increase in EnerBank notes receivable	(200)	(87)
Purchase of notes receivable by EnerBank	(87)	0
Proceeds from DB SERP investments	146	0
Proceeds from the sale of EnerBank notes receivable	0	19
Cost to retire property and other investing activities	(102)	(78)
Net cash used in investing activities	(1,815)	(1,354)
Cash Flows from Financing Activities
Proceeds from issuance of debt	1,044	1,108
Retirement of debt	(705)	(668)
Increase in EnerBank certificates of deposit	288	40
Increase (decrease) in notes payable	110
Increase (decrease) in notes payable		(168)
Issuance of common stock	39	80
Payment of dividends on common and preferred stock	(305)	(282)
Payment of capital lease obligations and other financing costs	(59)	(39)
Net cash provided by financing activities	412	71
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	162	(84)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	204	257
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	366	173
Non-cash transactions
Capital expenditures not paid	159	153
Consumers Energy Company
Cash Flows from Operating Activities
Net income	574	496
Adjustments to reconcile net income to net cash provided by operating activities
Deferred income taxes and investment tax credit	40	204
Other non-cash operating activities and reconciling adjustments	33	71
Cash provided by (used in) changes in assets and liabilities
Accounts and notes receivable and accrued revenue	178	184
Inventories	(75)	(161)
Accounts payable and accrued refunds	(48)	(10)
Other current and non-current assets and liabilities	(128)	(221)
Net cash provided by operating activities	1,255	1,209
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under capital lease)	(1,339)	(1,196)
Proceeds from DB SERP investments	106	0
DB SERP investment in note receivable - related party	(106)	0
Cost to retire property and other investing activities	(96)	(82)
Net cash used in investing activities	(1,435)	(1,278)
Cash Flows from Financing Activities
Proceeds from issuance of debt	544	534
Retirement of debt	(330)	(443)
Increase (decrease) in notes payable	110
Increase (decrease) in notes payable		(168)
Stockholder contribution	250	450
Payment of dividends on common and preferred stock	(393)	(348)
Payment of capital lease obligations and other financing costs	(28)	(23)
Net cash provided by financing activities	153	2
Net Increase (Decrease) in Cash and Cash Equivalents, Including Restricted Amounts	(27)	(67)
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period	65	152
Cash and Cash Equivalents, Including Restricted Amounts, End of Period	38	85
Non-cash transactions
Capital expenditures not paid	$ 128	$ 140