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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2012
Assets and Liabilities Measured at Fair Value on a Recurring Basis |
|  | In Millions |
March 31, 2012 |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 271 |  |  | $ | 271 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 14 |  |  |  | 14 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 5 |  |  |  | 5 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 126 |  |  |  | 126 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 3 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |
Total |  | $ | 419 |  |  | $ | 417 |  |  | $ | 1 |  |  | $ | 1 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 5 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 7 |  |  |  | — |  |  |  | 5 |  |  |  | 2 |
Total |  | $ | 12 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 2 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 122 |  |  | $ | 122 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 13 |  |  |  | 13 |  |  |  | — |  |  |  | — |
CMS Energy common stock |  |  | 29 |  |  |  | 29 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 3 |  |  |  | 3 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 85 |  |  |  | 85 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
Total |  | $ | 253 |  |  | $ | 252 |  |  | $ | — |  |  | $ | 1 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
Total |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
|  | In Millions |
December 31, 2011 |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 109 |  |  | $ | 109 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 4 |  |  |  | 4 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | — |
Mutual funds |  |  | 113 |  |  |  | 113 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 3 |  |  |  | 1 |  |  |  | — |  |  |  | 2 |
Total |  | $ | 245 |  |  | $ | 243 |  |  | $ | — |  |  | $ | 2 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 4 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 7 |  |  |  | — |  |  |  | 3 |  |  |  | 4 |
Total |  | $ | 11 |  |  | $ | 4 |  |  | $ | 3 |  |  | $ | 4 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 56 |  |  | $ | 56 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 14 |  |  |  | 14 |  |  |  | — |  |  |  | — |
CMS Energy common stock |  |  | 35 |  |  |  | 35 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 3 |  |  |  | 3 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | — |
Mutual funds |  |  | 74 |  |  |  | 74 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Total |  | $ | 185 |  |  | $ | 183 |  |  | $ | — |  |  | $ | 2 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
Total |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
Consumers Energy Company [Member] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |
|  | In Millions |
March 31, 2012 |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 271 |  |  | $ | 271 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 14 |  |  |  | 14 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 5 |  |  |  | 5 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 126 |  |  |  | 126 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 3 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |
Total |  | $ | 419 |  |  | $ | 417 |  |  | $ | 1 |  |  | $ | 1 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 5 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 7 |  |  |  | — |  |  |  | 5 |  |  |  | 2 |
Total |  | $ | 12 |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | 2 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 122 |  |  | $ | 122 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 13 |  |  |  | 13 |  |  |  | — |  |  |  | — |
CMS Energy common stock |  |  | 29 |  |  |  | 29 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 3 |  |  |  | 3 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  |  | 85 |  |  |  | 85 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
Total |  | $ | 253 |  |  | $ | 252 |  |  | $ | — |  |  | $ | 1 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
Total |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
|  | In Millions |
December 31, 2011 |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 109 |  |  | $ | 109 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 15 |  |  |  | 15 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 4 |  |  |  | 4 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | — |
Mutual funds |  |  | 113 |  |  |  | 113 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 3 |  |  |  | 1 |  |  |  | — |  |  |  | 2 |
Total |  | $ | 245 |  |  | $ | 243 |  |  | $ | — |  |  | $ | 2 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 4 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 7 |  |  |  | — |  |  |  | 3 |  |  |  | 4 |
Total |  | $ | 11 |  |  | $ | 4 |  |  | $ | 3 |  |  | $ | 4 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 56 |  |  | $ | 56 |  |  | $ | — |  |  | $ | — |
Restricted cash equivalents |  |  | 14 |  |  |  | 14 |  |  |  | — |  |  |  | — |
CMS Energy common stock |  |  | 35 |  |  |  | 35 |  |  |  | — |  |  |  | — |
Nonqualified deferred compensation plan assets |  |  | 3 |  |  |  | 3 |  |  |  | — |  |  |  | — |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 1 |  |  |  | 1 |  |  |  | — |  |  |  | — |
Mutual funds |  |  | 74 |  |  |  | 74 |  |  |  | — |  |  |  | — |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2 |
Total |  | $ | 185 |  |  | $ | 183 |  |  | $ | — |  |  | $ | 2 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |
Total |  | $ | 3 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |

X
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration