Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 168	$ 140
Restricted cash and cash equivalents	17	17
Accounts receivable and accrued revenue, less allowance of $29 in 2020 and $20 in 2019	863	886
Notes receivable, less allowance of $32 in 2020 and $33 in 2019	275	242
Accounts receivable – related parties	19	17
Inventories at average cost
Gas in underground storage	353	399
Materials and supplies	155	140
Generating plant fuel stock	68	66
Deferred property taxes	332	305
Regulatory assets	42	33
Prepayments and other current assets	112	86
Total current assets	2,404	2,331
Plant, Property, and Equipment
Plant, property, and equipment, gross	27,907	25,390
Less accumulated depreciation and amortization	7,953	7,360
Plant, property, and equipment, net	19,954	18,030
Construction work in progress	1,085	896
Total plant, property, and equipment	21,039	18,926
Other Non‑current Assets
Regulatory assets	2,653	2,489
Accounts and notes receivable, less allowance of $91 in 2020 and $— in 2019	2,631	2,281
Investments	70	71
Other	869	739
Total other non‑current assets	6,223	5,580
Total Assets	29,666	26,837
Current Liabilities
Current portion of long-term debt, finance leases, and other financing	1,506	1,130
Notes payable	0	90
Accounts payable	671	622
Accounts payable – related parties	7	13
Accrued rate refunds	20	35
Accrued interest	106	104
Accrued taxes	457	437
Regulatory liabilities	151	87
Other current liabilities	156	186
Total current liabilities	3,074	2,704
Non‑current Liabilities
Long-term debt	13,634	11,951
Non-current portion of finance leases and other financing	56	76
Regulatory liabilities	3,744	3,742
Postretirement benefits	152	674
Asset retirement obligations	553	477
Deferred investment tax credit	115	120
Deferred income taxes	1,863	1,655
Other non‑current liabilities	398	383
Total non‑current liabilities	20,515	19,078
Commitments and Contingencies
Common stockholders’ equity
Common stock	3	3
Other paid-in capital	5,365	5,113
Accumulated other comprehensive loss	(86)	(73)
Retained earnings (accumulated deficit)	214	(25)
Total common stockholders’ equity	5,496	5,018
Noncontrolling interests	581	37
Total equity	6,077	5,055
Total Liabilities and Equity	29,666	26,837
Consumers Energy Company
Current Assets
Cash and cash equivalents	20	11
Restricted cash and cash equivalents	15	17
Accounts receivable and accrued revenue, less allowance of $29 in 2020 and $20 in 2019	828	827
Accounts receivable – related parties	18	9
Inventories at average cost
Gas in underground storage	353	399
Materials and supplies	149	135
Generating plant fuel stock	67	63
Deferred property taxes	332	305
Regulatory assets	42	33
Prepayments and other current assets	68	73
Total current assets	1,892	1,872
Plant, Property, and Equipment
Plant, property, and equipment, gross	26,757	24,963
Less accumulated depreciation and amortization	7,844	7,272
Plant, property, and equipment, net	18,913	17,691
Construction work in progress	1,058	879
Total plant, property, and equipment	19,971	18,570
Other Non‑current Assets
Regulatory assets	2,653	2,489
Accounts and notes receivable, less allowance of $91 in 2020 and $— in 2019	25	29
Accounts and notes receivable – related parties	105	102
Other	753	637
Total other non‑current assets	3,536	3,257
Total Assets	25,399	23,699
Current Liabilities
Current portion of long-term debt, finance leases, and other financing	384	221
Notes payable	0	90
Notes payable – related parties	307	0
Accounts payable	636	593
Accounts payable – related parties	7	20
Accrued rate refunds	20	35
Accrued interest	72	67
Accrued taxes	458	481
Regulatory liabilities	151	87
Other current liabilities	104	118
Total current liabilities	2,139	1,712
Non‑current Liabilities
Long-term debt	7,742	7,048
Non-current portion of finance leases and other financing	56	76
Regulatory liabilities	3,744	3,742
Postretirement benefits	112	622
Asset retirement obligations	530	474
Deferred investment tax credit	115	120
Deferred income taxes	2,094	1,864
Other non‑current liabilities	311	304
Total non‑current liabilities	14,704	14,250
Commitments and Contingencies
Common stockholders’ equity
Common stock	841	841
Other paid-in capital	6,024	5,374
Accumulated other comprehensive loss	(36)	(28)
Retained earnings (accumulated deficit)	1,690	1,513
Total common stockholders’ equity	8,519	7,700
Cumulative preferred stock, $4.50 series	37	37
Total equity	8,556	7,737
Total Liabilities and Equity	$ 25,399	$ 23,699