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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 93 |  | $ 161 |
Restricted cash and cash equivalents | 29 |  | 27 |
Accounts receivable and accrued revenue, less allowances | 855 |  | 869 |
Notes receivable | 41 |  | 49 |
Accounts receivable - related parties | 10 |  | 10 |
Accrued power supply revenue | 32 |  |  |
Inventories at average cost |  |  |  |
Gas in underground storage | 820 |  | 929 |
Materials and supplies | 96 |  | 92 |
Generating plant fuel stock | 168 |  | 166 |
Deferred income taxes |  |  | 24 |
Deferred property taxes | 190 |  | 187 |
Regulatory assets | 35 |  | 1 |
Prepayments and other current assets | 53 |  | 50 |
Total current assets | 2,422 |  | 2,565 |
Plant, Property, and Equipment |  |  |  |
Plant, property, and equipment, gross | 15,592 |  | 14,751 |
Less accumulated depreciation and amortization | 5,121 |  | 4,901 |
Plant, property, and equipment, net | 10,471 |  | 9,850 |
Construction work in progress | 1,080 |  | 783 |
Total plant, property, and equipment | 11,551 | [1] | 10,633 | [1]
Other Non-current Assets |  |  |  |
Regulatory assets, noncurrent | 2,287 |  | 2,466 |
Accounts and notes receivable | 521 |  | 462 |
Investments | 57 |  | 50 |
Other | 293 |  | 276 |
Total other non-current assets | 3,158 |  | 3,254 |
Total Assets | 17,131 |  | 16,452 |
Liabilities and Equity |  |  |  |
Current portion of long-term debt, capital and finance lease obligations | 541 |  | 1,057 |
Notes payable | 110 |  |  |
Accounts payable | 512 |  | 575 |
Accounts payable - related parties | 9 |  | 9 |
Accrued rate refunds | 6 |  | 30 |
Accrued interest | 95 |  | 101 |
Accrued taxes | 279 |  | 282 |
Deferred income taxes | 68 |  |  |
Regulatory liabilities, current | 25 |  | 125 |
Other current liabilities | 152 |  | 159 |
Total current liabilities | 1,797 |  | 2,338 |
Non-current Liabilities |  |  |  |
Long-term debt | 6,710 |  | 6,040 |
Non-current portion of capital and finance lease obligations | 153 |  | 167 |
Regulatory liabilities | 2,101 |  | 1,875 |
Postretirement benefits | 1,451 |  | 1,289 |
Asset retirement obligations | 312 |  | 254 |
Deferred investment tax credit | 43 |  | 46 |
Deferred income taxes | 1,015 |  | 1,035 |
Other non-current liabilities | 311 |  | 336 |
Total non-current liabilities | 12,096 |  | 11,042 |
Commitments and Contingencies (Notes 3, 4, 5, and 7) |  |  |  |
Equity |  |  |  |
Common stock | 3 |  | 3 |
Other paid-in capital | 4,669 |  | 4,627 |
Accumulated other comprehensive loss | (55) |  | (49) |
Retained earnings (Accumulated deficit) | (1,423) |  | (1,553) |
Total common stockholders equity | 3,194 |  | 3,028 |
Noncontrolling interests | 44 |  | 44 |
Total equity | 3,238 |  | 3,072 |
Total Liabilities and Equity | 17,131 |  | 16,452 |
Consumers Energy Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 5 |  | 85 |
Restricted cash and cash equivalents | 28 |  | 26 |
Accounts receivable and accrued revenue, less allowances | 844 |  | 860 |
Notes receivable |  |  | 23 |
Accounts receivable - related parties | 1 |  | 1 |
Accrued power supply revenue | 32 |  |  |
Inventories at average cost |  |  |  |
Gas in underground storage | 816 |  | 929 |
Materials and supplies | 92 |  | 88 |
Generating plant fuel stock | 167 |  | 164 |
Deferred property taxes | 190 |  | 187 |
Regulatory assets | 35 |  | 1 |
Prepayments and other current assets | 45 |  | 43 |
Total current assets | 2,255 |  | 2,407 |
Plant, Property, and Equipment |  |  |  |
Plant, property, and equipment, gross | 15,456 |  | 14,621 |
Less accumulated depreciation and amortization | 5,061 |  | 4,846 |
Plant, property, and equipment, net | 10,395 |  | 9,775 |
Construction work in progress | 1,080 |  | 782 |
Total plant, property, and equipment | 11,475 | [1] | 10,557 | [1]
Other Non-current Assets |  |  |  |
Regulatory assets, noncurrent | 2,287 |  | 2,466 |
Accounts and notes receivable | 17 |  | 1 |
Investments | 32 |  | 35 |
Other | 209 |  | 196 |
Total other non-current assets | 2,545 |  | 2,698 |
Total Assets | 16,275 |  | 15,662 |
Liabilities and Equity |  |  |  |
Current portion of long-term debt, capital and finance lease obligations | 63 |  | 363 |
Notes payable | 110 |  |  |
Accounts payable | 501 |  | 561 |
Accounts payable - related parties | 11 |  | 11 |
Accrued rate refunds | 6 |  | 30 |
Accrued interest | 65 |  | 73 |
Accrued taxes | 376 |  | 287 |
Deferred income taxes | 144 |  | 73 |
Regulatory liabilities, current | 25 |  | 125 |
Other current liabilities | 109 |  | 119 |
Total current liabilities | 1,410 |  | 1,642 |
Non-current Liabilities |  |  |  |
Long-term debt | 4,297 |  | 3,987 |
Non-current portion of capital and finance lease obligations | 153 |  | 167 |
Regulatory liabilities | 2,101 |  | 1,875 |
Postretirement benefits | 1,385 |  | 1,225 |
Asset retirement obligations | 311 |  | 253 |
Deferred investment tax credit | 43 |  | 46 |
Deferred income taxes | 1,741 |  | 1,817 |
Other non-current liabilities | 252 |  | 256 |
Total non-current liabilities | 10,283 |  | 9,626 |
Commitments and Contingencies (Notes 3, 4, 5, and 7) |  |  |  |
Equity |  |  |  |
Common stock | 841 |  | 841 |
Other paid-in capital | 3,107 |  | 2,957 |
Accumulated other comprehensive loss | (8) |  | (2) |
Retained earnings (Accumulated deficit) | 598 |  | 554 |
Total common stockholders equity | 4,538 |  | 4,350 |
Preferred stock | 44 |  | 44 |
Total equity | 4,582 |  | 4,394 |
Total Liabilities and Equity | $ 16,275 |  | $ 15,662 |
[1] | For the year ended December 31, 2012, utility plant additions were $999 million and utility plant retirements were $168 million. For the year ended December 31, 2011, utility plant additions were $700 million and utility plant retirements were $104 million.

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant