Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents		$ 323	$ 182
Restricted cash and cash equivalents	[1]	42	17
Accounts receivable and accrued revenue, less allowance of $20 in both periods		710	1,032
Notes receivable, less allowance of $23 in 2018 and $20 in 2017		237	198
Notes receivable held for sale		26	2
Accounts receivable – related parties		15	12
Inventories at average cost
Gas in underground storage		551	458
Materials and supplies		140	133
Generating plant fuel stock		50	81
Deferred property taxes		167	257
Regulatory assets		10	20
Prepayments and other current assets		103	83
Total current assets		2,374	2,475
Plant, Property, and Equipment
Plant, property, and equipment, gross		23,751	22,506
Less accumulated depreciation and amortization		6,909	6,510
Plant, property, and equipment, net		16,842	15,996
Construction work in progress		948	765
Total plant, property, and equipment		17,790	16,761
Other Non-current Assets
Regulatory assets		1,655	1,764
Accounts and notes receivable		1,393	1,187
Investments		72	64
Other		629	799
Total other non-current assets		3,749	3,814
Total Assets		23,913	23,050
Current Liabilities
Current portion of long-term debt, capital leases, and financing obligation		1,971	1,103
Notes payable		279	170
Accounts payable		680	725
Accounts payable – related parties		9	15
Accrued rate refunds		14	33
Accrued interest		83	103
Accrued taxes		107	360
Regulatory liabilities		165	80
Other current liabilities		134	195
Total current liabilities		3,442	2,784
Non-current Liabilities
Long-term debt		8,869	9,123
Non-current portion of capital leases and financing obligation		75	91
Regulatory liabilities		3,745	3,715
Postretirement benefits		797	766
Asset retirement obligations		421	430
Deferred investment tax credit		101	87
Deferred income taxes		1,382	1,269
Other non-current liabilities		295	307
Total non-current liabilities		15,685	15,788
Commitments and contingencies
Common stockholders’ equity
Common stock, authorized 350.0 shares; outstanding 283.3 shares in 2018 and 281.6 shares in 2017		3	3
Other paid-in capital		5,083	5,019
Accumulated other comprehensive loss		(59)	(50)
Accumulated deficit		(278)	(531)
Total common stockholders’ equity		4,749	4,441
Noncontrolling interests		37	37
Total equity		4,786	4,478
Total Liabilities and Equity		23,913	23,050
Consumers Energy Company
Current Assets
Cash and cash equivalents		9	44
Restricted cash and cash equivalents	[1]	28	17
Accounts receivable and accrued revenue, less allowance of $20 in both periods		686	885
Notes receivable, less allowance of $23 in 2018 and $20 in 2017		17	17
Accounts receivable – related parties		8	2
Inventories at average cost
Gas in underground storage		551	458
Materials and supplies		135	128
Generating plant fuel stock		44	76
Deferred property taxes		167	257
Regulatory assets		10	20
Prepayments and other current assets		90	71
Total current assets		1,745	1,975
Plant, Property, and Equipment
Plant, property, and equipment, gross		23,322	22,318
Less accumulated depreciation and amortization		6,834	6,441
Plant, property, and equipment, net		16,488	15,877
Construction work in progress		937	753
Total plant, property, and equipment		17,425	16,630
Other Non-current Assets
Regulatory assets		1,655	1,764
Accounts and notes receivable		22	22
Notes receivable – related party		100	0
Other		545	708
Total other non-current assets		2,322	2,494
Total Assets		21,492	21,099
Current Liabilities
Current portion of long-term debt, capital leases, and financing obligation		898	365
Notes payable		279	170
Accounts payable		636	701
Accounts payable – related parties		13	19
Accrued rate refunds		14	33
Accrued interest		58	67
Accrued taxes		148	542
Regulatory liabilities		165	80
Other current liabilities		96	159
Total current liabilities		2,307	2,136
Non-current Liabilities
Long-term debt		5,239	5,561
Non-current portion of capital leases and financing obligation		75	91
Regulatory liabilities		3,745	3,715
Postretirement benefits		741	711
Asset retirement obligations		417	429
Deferred investment tax credit		101	87
Deferred income taxes		1,711	1,640
Other non-current liabilities		233	241
Total non-current liabilities		12,262	12,475
Commitments and contingencies
Common stockholders’ equity
Common stock, authorized 350.0 shares; outstanding 283.3 shares in 2018 and 281.6 shares in 2017		841	841
Other paid-in capital		4,699	4,449
Accumulated other comprehensive loss		(27)	(12)
Accumulated deficit		1,373	1,173
Total common stockholders’ equity		6,886	6,451
Preferred stock		37	37
Total equity		6,923	6,488
Total Liabilities and Equity		$ 21,492	$ 21,099

[1] 1 All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 3.