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Consolidated Balance Sheets - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Current Assets |  |  |
Cash and cash equivalents |  | $ 339 | $ 266
Restricted cash and cash equivalents |  | 28 | 19
Accounts receivable and accrued revenue, less allowances |  | 634 | 774
Notes receivable, less allowances |  | 146 | 128
Notes receivable held for sale |  | 41 | 16
Accounts receivable - related parties |  | 12 | 11
Inventories at average cost |  |  |
Gas in underground storage |  | 553 | 568
Materials and supplies |  | 119 | 126
Generating plant fuel stock |  | 64 | 84
Deferred property taxes |  | 152 | 235
Regulatory assets |  | 16 | 16
Prepayments and other current assets |  | 94 | 77
Total current assets |  | 2,198 | 2,320
Plant, Property, and Equipment |  |  |
Plant, property, and equipment, gross |  | 20,698 | 18,943
Less accumulated depreciation and amortization |  | 5,953 | 5,747
Plant, property, and equipment, net |  | 14,745 | 13,196
Construction work in progress |  | 698 | 1,509
Total plant, property, and equipment |  | 15,443 | 14,705
Other Non-current Assets |  |  |
Regulatory assets |  | 1,765 | 1,840
Accounts and notes receivable |  | 1,110 | 1,027
Investments |  | 68 | 64
Other |  | 258 | 343
Total other non-current assets |  | 3,201 | 3,274
Total Assets | [1] | 20,842 | 20,299
Current Liabilities |  |  |
Current portion of long-term debt, capital leases, and financing obligation |  | 1,005 | 706
Notes payable |  | 75 | 249
Accounts payable |  | 539 | 633
Accounts payable - related parties |  | 9 | 9
Accrued rate refunds |  | 33 | 26
Accrued interest |  | 76 | 106
Accrued taxes |  | 93 | 349
Regulatory liabilities |  | 80 | 82
Other current liabilities |  | 159 | 142
Total current liabilities |  | 2,069 | 2,302
Non-current Liabilities |  |  |
Long-term debt |  | 8,722 | 8,400
Non-current portion of capital leases and financing obligation |  | 110 | 118
Regulatory liabilities |  | 2,053 | 2,088
Postretirement benefits |  | 560 | 591
Asset retirement obligations |  | 445 | 439
Deferred investment tax credit |  | 74 | 56
Deferred income taxes |  | 2,230 | 2,017
Other non-current liabilities |  | 283 | 313
Total non-current liabilities |  | 14,477 | 14,022
Commitments and Contingencies (Notes 2 and 3) |  |  |
Common stockholder's equity |  |  |
Common stock |  | 3 | 3
Other paid-in capital |  | 4,908 | 4,837
Accumulated other comprehensive loss |  | (45) | (47)
Retained earnings (Accumulated deficit) |  | (607) | (855)
Total common stockholders' equity |  | 4,259 | 3,938
Noncontrolling interests |  | 37 | 37
Total equity |  | 4,296 | 3,975
Total Liabilities and Equity |  | 20,842 | 20,299
Consumers Energy Company [Member] |  |  |
Current Assets |  |  |
Cash and cash equivalents |  | 21 | 50
Restricted cash and cash equivalents |  | 28 | 19
Accounts receivable and accrued revenue, less allowances |  | 616 | 758
Accounts receivable - related parties |  | 2 | 17
Inventories at average cost |  |  |
Gas in underground storage |  | 553 | 568
Materials and supplies |  | 114 | 120
Generating plant fuel stock |  | 60 | 80
Deferred property taxes |  | 152 | 235
Regulatory assets |  | 16 | 16
Prepayments and other current assets |  | 85 | 66
Total current assets |  | 1,647 | 1,929
Plant, Property, and Equipment |  |  |
Plant, property, and equipment, gross |  | 20,528 | 18,797
Less accumulated depreciation and amortization |  | 5,893 | 5,676
Plant, property, and equipment, net |  | 14,635 | 13,121
Construction work in progress |  | 692 | 1,467
Total plant, property, and equipment |  | 15,327 | 14,588
Other Non-current Assets |  |  |
Regulatory assets |  | 1,765 | 1,840
Accounts and notes receivable |  | 56 | 10
Investments |  | 34 | 29
Other |  | 151 | 239
Total other non-current assets |  | 2,006 | 2,118
Total Assets | [1] | 18,980 | 18,635
Current Liabilities |  |  |
Current portion of long-term debt, capital leases, and financing obligation |  | 296 | 220
Notes payable |  | 75 | 249
Accounts payable |  | 521 | 613
Accounts payable - related parties |  | 9 | 15
Accrued rate refunds |  | 33 | 26
Accrued interest |  | 48 | 65
Accrued taxes |  | 114 | 352
Regulatory liabilities |  | 80 | 82
Other current liabilities |  | 127 | 109
Total current liabilities |  | 1,303 | 1,731
Non-current Liabilities |  |  |
Long-term debt |  | 5,365 | 5,183
Non-current portion of capital leases and financing obligation |  | 110 | 118
Regulatory liabilities |  | 2,053 | 2,088
Postretirement benefits |  | 500 | 529
Asset retirement obligations |  | 444 | 438
Deferred investment tax credit |  | 74 | 56
Deferred income taxes |  | 2,958 | 2,710
Other non-current liabilities |  | 212 | 236
Total non-current liabilities |  | 11,716 | 11,358
Commitments and Contingencies (Notes 2 and 3) |  |  |
Common stockholder's equity |  |  |
Common stock |  | 841 | 841
Other paid-in capital |  | 3,999 | 3,724
Accumulated other comprehensive loss |  | (3) | (6)
Retained earnings (Accumulated deficit) |  | 1,087 | 950
Total common stockholders' equity |  | 5,924 | 5,509
Preferred stock |  | 37 | 37
Total equity |  | 5,961 | 5,546
Total Liabilities and Equity |  | $ 18,980 | $ 18,635
[1] | CMS Energy and Consumers changed the reporting of debt issuance costs on their consolidated balance sheets in accordance with ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, as of January 1, 2016, and retrospectively adjusted prior-period amounts for comparability. For further details on the implementation of this standard, see Note 1, New Accounting Standards.

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- Definition Carrying amount as of the balance sheet date of natural gas stored underground in depleted gas reservoirs, aquifers, or salt caverns to meet seasonal and peak load demands, and also as insurance against unforeseen supply disruptions, and deemed to be a current asset because it is expected to be used within twelve months or in the normal operating cycle. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of fossil fuel included in inventory classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.21) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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- Definition The aggregate of amounts due from customers or clients more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date more than one year from the balance sheet date, reduced to their estimated net realizable fair value by an allowance established by the Company of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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