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Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2011
Schedule of Fair Value of Derivative Instruments |
In Millions |
|  | Derivative Assets |  |  | Derivative Liabilities |
|  | Balance |  |  | Fair Value at |  |  | Balance |  |  | Fair Value at |
|  | Sheet |  |  | June 30, |  |  | December 31, |  |  | Sheet |  |  | June 30, |  |  | December 31, |
|  | Location |  |  | 2011 |  |  | 2010 |  |  | Location |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts1 |  | Other assets |  |  | $ | 3 |  |  | $ | 1 |  |  | Other liabilities2 |  |  | $ | 3 |  |  | $ | 4 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | Other assets |  |  | $ | 3 |  |  | $ | 1 |  |  | Other liabilities |  |  | $ | — |  |  | $ | — |
1 |  | Assets and liabilities are presented gross and exclude the impact of offsetting derivative assets and liabilities under master netting agreements, which was less than $1 million at June 30, 2011 and December 31, 2010.
2 |  | Liabilities exclude the impact of offsetting cash margin deposits paid by CMS ERM to other parties, which was less than $1 million at June 30, 2011 and December 31, 2010. CMS Energy presents these liabilities net of these impacts on its consolidated balance sheets.
Gain/(Loss) Recognized in Income for Derivative Instruments |
In Millions |
|  | Amount of Gain (Loss) on Derivatives Recognized in Income |
Location of Gain (Loss) on |  | Three Months Ended June 30 |  |  | Six Months Ended June 30 |
Derivatives Recognized in Income |  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  | $ | (1 | ) |  | $ | (2 | ) |  | $ | — |  |  | $ | 3 |
Fuel for electric generation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |
Purchased and interchange power |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |
Total CMS Energy |  | $ | (1 | ) |  | $ | (2 | ) |  | $ | — |  |  | $ | 6 |
Consumers Energy Company [Member] |
Schedule of Fair Value of Derivative Instruments |
In Millions |
|  | Derivative Assets |  |  | Derivative Liabilities |
|  | Balance |  |  | Fair Value at |  |  | Balance |  |  | Fair Value at |
|  | Sheet |  |  | June 30, |  |  | December 31, |  |  | Sheet |  |  | June 30, |  |  | December 31, |
|  | Location |  |  | 2011 |  |  | 2010 |  |  | Location |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts1 |  | Other assets |  |  | $ | 3 |  |  | $ | 1 |  |  | Other liabilities2 |  |  | $ | 3 |  |  | $ | 4 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | Other assets |  |  | $ | 3 |  |  | $ | 1 |  |  | Other liabilities |  |  | $ | — |  |  | $ | — |
1 |  | Assets and liabilities are presented gross and exclude the impact of offsetting derivative assets and liabilities under master netting agreements, which was less than $1 million at June 30, 2011 and December 31, 2010.
2 |  | Liabilities exclude the impact of offsetting cash margin deposits paid by CMS ERM to other parties, which was less than $1 million at June 30, 2011 and December 31, 2010. CMS Energy presents these liabilities net of these impacts on its consolidated balance sheets.

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -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. + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -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. + Details
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