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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
In Millions
December 31, 2012 | Total | Level 1 | Level 2 | Level 3 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 53 |  | $ | 53 |  | $ | - |  | $ | - |
Restricted cash equivalents |  |  | 14 |  |  | 14 |  |  | - |  |  | - |
Nonqualified deferred compensation plan assets |  |  | 5 |  |  | 5 |  |  | - |  |  | - |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  | 2 |  |  | - |  |  | - |
Mutual funds |  |  | 126 |  |  | 126 |  |  | - |  |  | - |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 3 |  |  | - |  |  | - |  |  | 3 |
Total |  | $ | 203 |  | $ | 200 |  | $ | - |  | $ | 3 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 5 |  | $ | 5 |  | $ | - |  | $ | - |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 4 |  |  | - |  |  | 3 |  |  | 1 |
Total |  | $ | 9 |  | $ | 5 |  | $ | 3 |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash equivalents |  | $ | 13 |  | $ | 13 |  | $ | - |  | $ | - |
CMS Energy common stock |  |  | 32 |  |  | 32 |  |  | - |  |  | - |
Nonqualified deferred compensation plan assets |  |  | 4 |  |  | 4 |  |  | - |  |  | - |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 1 |  |  | 1 |  |  | - |  |  | - |
Mutual funds |  |  | 85 |  |  | 85 |  |  | - |  |  | - |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  | - |  |  | - |  |  | 2 |
Total |  | $ | 137 |  | $ | 135 |  | $ | - |  | $ | 2 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 4 |  | $ | 4 |  | $ | - |  | $ | - |
Total |  | $ | 4 |  | $ | 4 |  | $ | - |  | $ | - |
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 |  |  | - |  |  | - |
DB 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 |  |  | - |  |  | - |
DB 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 |  | $ | - |  | $ | - |
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (2) |  | $ | (3) |  | $ | (8) |
Total gains included in earnings1 |  |  | 3 |  |  | 2 |  |  | 5 |
Total gains offset through regulatory accounting |  |  | 6 |  |  | 2 |  |  | 3 |
Purchases |  |  | 1 |  |  | 1 |  |  | 1 |
Sales |  |  | - |  |  | (4) |  |  | (1) |
Settlements |  |  | (6) |  |  | - |  |  | (3) |
Balance at end of period |  | $ | 2 |  | $ | (2) |  | $ | (3) |
Unrealized gains included in earnings relating to assets and liabilities |  |  |  |  |  |  |  |  |  |
still held at end of period1 |  | $ | 2 |  | $ | 2 |  | $ | 4 |
Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 2 |  | $ | 1 |  | $ | - |
Total gains offset through regulatory accounting |  |  | 6 |  |  | 2 |  |  | 3 |
Purchases |  |  | 1 |  |  | 1 |  |  | 1 |
Settlements |  |  | (7) |  |  | (2) |  |  | (3) |
Balance at end of period |  | $ | 2 |  | $ | 2 |  | $ | 1 |
1 CMS Energy records realized and unrealized gains and losses for Level 3 recurring fair value measurements in earnings as a component of operating revenue or maintenance and other operating expenses on its consolidated statements of income.
Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis |
In Millions
| Level 1 | Level 2 | Level 3 | Losses |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held for sale |  | $ | - |  | $ | 5 |  | $ | - |  | $ | (6) |
Consumers Energy Company [Member] |
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
In Millions
December 31, 2012 | Total | Level 1 | Level 2 | Level 3 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 53 |  | $ | 53 |  | $ | - |  | $ | - |
Restricted cash equivalents |  |  | 14 |  |  | 14 |  |  | - |  |  | - |
Nonqualified deferred compensation plan assets |  |  | 5 |  |  | 5 |  |  | - |  |  | - |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 2 |  |  | 2 |  |  | - |  |  | - |
Mutual funds |  |  | 126 |  |  | 126 |  |  | - |  |  | - |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 3 |  |  | - |  |  | - |  |  | 3 |
Total |  | $ | 203 |  | $ | 200 |  | $ | - |  | $ | 3 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 5 |  | $ | 5 |  | $ | - |  | $ | - |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 4 |  |  | - |  |  | 3 |  |  | 1 |
Total |  | $ | 9 |  | $ | 5 |  | $ | 3 |  | $ | 1 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash equivalents |  | $ | 13 |  | $ | 13 |  | $ | - |  | $ | - |
CMS Energy common stock |  |  | 32 |  |  | 32 |  |  | - |  |  | - |
Nonqualified deferred compensation plan assets |  |  | 4 |  |  | 4 |  |  | - |  |  | - |
DB SERP |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  | 1 |  |  | 1 |  |  | - |  |  | - |
Mutual funds |  |  | 85 |  |  | 85 |  |  | - |  |  | - |
Derivative instruments |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  | 2 |  |  | - |  |  | - |  |  | 2 |
Total |  | $ | 137 |  | $ | 135 |  | $ | - |  | $ | 2 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified deferred compensation plan liabilities |  | $ | 4 |  | $ | 4 |  | $ | - |  | $ | - |
Total |  | $ | 4 |  | $ | 4 |  | $ | - |  | $ | - |
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 |  |  | - |  |  | - |
DB 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 |  |  | - |  |  | - |
DB 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 |  | $ | - |  | $ | - |
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs |
In Millions
Years Ended December 31 | 2012 | 2011 | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (2) |  | $ | (3) |  | $ | (8) |
Total gains included in earnings1 |  |  | 3 |  |  | 2 |  |  | 5 |
Total gains offset through regulatory accounting |  |  | 6 |  |  | 2 |  |  | 3 |
Purchases |  |  | 1 |  |  | 1 |  |  | 1 |
Sales |  |  | - |  |  | (4) |  |  | (1) |
Settlements |  |  | (6) |  |  | - |  |  | (3) |
Balance at end of period |  | $ | 2 |  | $ | (2) |  | $ | (3) |
Unrealized gains included in earnings relating to assets and liabilities |  |  |  |  |  |  |  |  |  |
still held at end of period1 |  | $ | 2 |  | $ | 2 |  | $ | 4 |
Consumers |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 2 |  | $ | 1 |  | $ | - |
Total gains offset through regulatory accounting |  |  | 6 |  |  | 2 |  |  | 3 |
Purchases |  |  | 1 |  |  | 1 |  |  | 1 |
Settlements |  |  | (7) |  |  | (2) |  |  | (3) |
Balance at end of period |  | $ | 2 |  | $ | 2 |  | $ | 1 |
1 CMS Energy records realized and unrealized gains and losses for Level 3 recurring fair value measurements in earnings as a component of operating revenue or maintenance and other operating expenses on its consolidated statements of income.

X
- Definition Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liability. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -Subparagraph a, 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 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19296-110258 + Details
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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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