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Fair Value Measurements (Assets and Liabilties Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Cash equivalents | $ 875 |  | $ 183 |
Restricted cash equivalents | 15 |  | 6 |
Nonqualified deferred compensation plan assets | 4 |  | 6 |
Available for sale - fair value | 116 |  | 90 |
Commodity contracts | 3 |  | 1 |
Asset Total | 1,013 |  | 287 |
Nonqualified deferred compensation plan liabilities | 4 |  | 6 |
Commodity contracts | 3 |  | 4 |
Liabilities Total | 7 |  | 10 |
Assets classified as level three as a percentage of total assets measured at fair value | 1.00% |  | 1.00% |
Impact of master netting arrangements | 1 |  | 1 |
Impact of offsetting derivative assets and liabilites under master netting arrangments and offesetting cash margin deposits paid by CMS ERM | 1 |  | 1 |
Liabilities classified as level three as a percentage of total liabilities measured at fair value | 43.00% |  | 40.00% |
Consumers Energy Company [Member] | CMS Energy Common Stock [Member] |  |  |  |
Available for sale - fair value | 31 |  | 34 |
Consumers Energy Company [Member] | CMS Energy Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Available for sale - fair value | 31 |  | 34 |
Consumers Energy Company [Member] | CMS Energy Common Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Consumers Energy Company [Member] | CMS Energy Common Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] | Cash Equivalents [Member] |  |  |  |
Cash equivalents |  |  | 1 |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value | 59 |  | 39 |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member] | Cash Equivalents [Member] |  |  |  |
Cash equivalents |  |  |  |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value | 17 |  | 17 |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member] | Cash Equivalents [Member] |  |  |  |
Cash equivalents |  |  |  |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Consumers Energy Company [Member] | Supplemental Executive Retirement Plan [Member] |  |  |  |
Available for sale - fair value | 17 |  |  |
Consumers Energy Company [Member] | Supplemental Executive Retirement Plan [Member] | Cash Equivalents [Member] |  |  |  |
Cash equivalents |  |  | 1 |
Consumers Energy Company [Member] | Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value | 59 |  | 39 |
Consumers Energy Company [Member] | Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value | 17 |  | 17 |
Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] |  |  |  |
Cash equivalents |  |  | 1 |
Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value | 90 |  | 62 |
Fair Value, Inputs, Level 1 [Member] | Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member] |  |  |  |
Cash equivalents |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Fair Value, Inputs, Level 2 [Member] | Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value | 26 |  | 28 |
Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member] |  |  |  |
Cash equivalents |  |  |  |
Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Fair Value, Inputs, Level 3 [Member] | Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value |  |  |  |
Supplemental Executive Retirement Plan [Member] |  |  |  |
Cash equivalents |  |  | 1 |
Available for sale - fair value | 26 |  |  |
Supplemental Executive Retirement Plan [Member] | Mutual Fund [Member] |  |  |  |
Available for sale - fair value | 90 |  | 62 |
Supplemental Executive Retirement Plan [Member] | State and Municipal Bonds [Member] |  |  |  |
Available for sale - fair value | 26 |  | 28 |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Cash equivalents | 667 |  | 19 |
Restricted cash equivalents | 14 |  | 6 |
Nonqualified deferred compensation plan assets | 3 |  | 4 |
Commodity contracts |  |  |  |
Asset Total | 774 | [1] | 103 | [2]
Nonqualified deferred compensation plan liabilities | 3 |  | 4 |
Liabilities Total | 3 |  | 4 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Cash equivalents | 875 |  | 183 |
Restricted cash equivalents | 15 |  | 6 |
Nonqualified deferred compensation plan assets | 4 |  | 6 |
Commodity contracts |  |  |  |
Asset Total | 984 |  | 258 |
Nonqualified deferred compensation plan liabilities | 4 |  | 6 |
Commodity contracts |  |  |  |
Liabilities Total | 4 |  | 6 |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Cash equivalents |  |  |  |
Restricted cash equivalents |  |  |  |
Nonqualified deferred compensation plan assets |  |  |  |
Commodity contracts |  |  |  |
Asset Total | 17 | [1] | 17 | [2]
Nonqualified deferred compensation plan liabilities |  |  |  |
Liabilities Total |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Cash equivalents |  |  |  |
Restricted cash equivalents |  |  |  |
Nonqualified deferred compensation plan assets |  |  |  |
Commodity contracts |  |  |  |
Asset Total | 26 |  | 28 |
Nonqualified deferred compensation plan liabilities |  |  |  |
Commodity contracts |  |  |  |
Liabilities Total |  |  |  |
Consumers Energy Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Cash equivalents |  |  |  |
Restricted cash equivalents |  |  |  |
Nonqualified deferred compensation plan assets |  |  |  |
Commodity contracts | 3 |  | 1 |
Asset Total | 3 | [1] | 1 | [2]
Nonqualified deferred compensation plan liabilities |  |  |  |
Liabilities Total |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Cash equivalents |  |  |  |
Restricted cash equivalents |  |  |  |
Nonqualified deferred compensation plan assets |  |  |  |
Commodity contracts | 3 |  | 1 |
Asset Total | 3 |  | 1 |
Nonqualified deferred compensation plan liabilities |  |  |  |
Commodity contracts | 3 |  | 4 |
Liabilities Total | 3 |  | 4 |
Consumers Energy Company [Member] |  |  |  |
Cash equivalents | 667 |  | 19 |
Restricted cash equivalents | 14 |  | 6 |
Nonqualified deferred compensation plan assets | 3 |  | 4 |
Available for sale - fair value | 107 |  | 90 |
Commodity contracts | 3 |  | 1 |
Asset Total | 794 | [1] | 121 | [2]
Nonqualified deferred compensation plan liabilities | 3 |  | 4 |
Liabilities Total | $ 3 |  | $ 4 |
Assets classified as level three as a percentage of total assets measured at fair value | 1.00% |  | 1.00% |
[1] | At June 30, 2011, Consumers' assets classified as Level 3 represented less than one percent of Consumers' total assets measured at fair value.
[2] | At December 31, 2010, Consumers' assets classified as Level 3 represented one percent of Consumers' total assets measured at fair value.

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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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