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Financial Instruments (Schedule of Cost of Carrying Amounts and Fair Value of Long-Term Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Securities held to maturity, Cost or Carrying Amount | $ 7 |  | $ 5 |
Securities held to maturity - fair value | 7 |  | 6 |
Securities available for sale, Cost or Carrying Amount | 113 |  | 90 |
Securities available for sale, fair value | 113 |  | 90 |
Total unsecured consumer installment loans, net of an allowance for loan losses | 480 | [1] | 386 | [1]
Notes receivable, Fair Value | 504 | [1] | 407 | [1]
Long-term debt, Cost or Carrying Amount | 7,073 | [2] | 7,174 | [2]
Long-term Debt, Fair Value | 8,025 | [2] | 7,861 | [2]
Notes receivable | 49 |  | 70 |
Current portion of long-term debt | 1,033 |  | 726 |
Portion of long-term debt supported by third-party credit enhancements | 103 |  | 103 |
CMS Energy Corporation [Member] |  |  |  |
Notes receivable | 1 |  | 1 |
Consumers Energy Company [Member] |  |  |  |
Securities available for sale, Cost or Carrying Amount | 81 |  | 64 |
Securities available for sale, fair value | 109 |  | 90 |
Long-term debt, Cost or Carrying Amount | 4,326 | [3] | 4,525 | [3]
Long-term Debt, Fair Value | 4,882 | [3] | 4,891 | [3]
Notes receivable | 23 |  | 55 |
Current portion of long-term debt | 339 |  | 37 |
Portion of long-term debt supported by third-party credit enhancements | 103 |  | 103 |
EnerBank USA [Member] |  |  |  |
Total unsecured consumer installment loans, net of an allowance for loan losses | 480 |  | 386 |
Notes receivable | $ 19 |  | $ 11 |
[1] | Includes current portion of notes receivable of $19 million at December 31, 2011 and $11 million at December 31, 2010.
[2] | Includes current portion of long-term debt of $1.0 billion at December 31, 2011 and $726 million at December 31, 2010.
[3] | Includes current portion of long-term debt of $339 million at December 31, 2011 and $37 million at December 31, 2010.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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