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Reportable Segments (Reconciliation of Assets from Segment to Consolidated) (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Plant, property, and equipment, gross | $ 14,607 |  | $ 14,145 |
Total Assets | 15,958 |  | 15,616 |
Consumers Energy Company [Member] | Electric Utility [Member] |  |  |  |
Plant, property, and equipment, gross | 10,311 | [1] | 9,944 | [1]
Total Assets | 9,607 | [1] | 9,321 | [1]
Electric Utility [Member] |  |  |  |
Plant, property, and equipment, gross | 10,311 | [1] | 9,944 | [1]
Total Assets | 9,607 | [1] | 9,321 | [1]
Consumers Energy Company [Member] | Gas Utility [Member] |  |  |  |
Plant, property, and equipment, gross | 4,149 | [1] | 4,063 | [1]
Total Assets | 4,852 | [1] | 4,614 | [1]
Gas Utility [Member] |  |  |  |
Plant, property, and equipment, gross | 4,149 | [1] | 4,063 | [1]
Total Assets | 4,852 | [1] | 4,614 | [1]
Enterprises [Member] |  |  |  |
Plant, property, and equipment, gross | 109 |  | 102 |
Total Assets | 170 |  | 191 |
Consumers Energy Company [Member] | Other [Member] |  |  |  |
Plant, property, and equipment, gross | 15 |  | 15 |
Total Assets | 599 |  | 904 |
Other [Member] |  |  |  |
Plant, property, and equipment, gross | 38 |  | 36 |
Total Assets | 1,329 |  | 1,490 |
Consumers Energy Company [Member] |  |  |  |
Plant, property, and equipment, gross | 14,475 |  | 14,022 |
Total Assets | $ 15,058 |  | $ 14,839 |
[1] | Amounts include a portion of Consumers' other common assets attributable to both the electric and the gas utility businesses.

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- Definition Carrying amount at the balance sheet date for long-lived assets used in the normal conduct of business and not intended for resale. This can include land, physical structures, machinery, vehicles, furniture, computer equipment, similar items, including certain intangible assets. Amount is not net of depreciation, depletion, and amortization, and does not include construction work in progress. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Topic 210 -SubTopic 10 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 -Section S99 -Name Accounting Standards Codification -Publisher FASB -Paragraph 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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