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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2011
Schedule of Cost/Carrying Amounts and Fair Values of Long-Term Financial Instruments | In Millions
December 31 |  | 2011 |  |  | 2010 |
|  |  | Cost or Carrying Amount |  |  |  | Fair Value |  |  |  | Cost or Carrying Amount |  |  |  | Fair Value |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities held to maturity |  | $ | 7 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 6 |
Securities available for sale |  |  | 113 |  |  |  | 113 |  |  |  | 90 |  |  |  | 90 |
Notes receivable 1 |  |  | 480 |  |  |  | 504 |  |  |  | 386 |  |  |  | 407 |
Long-term debt 2 |  |  | 7,073 |  |  |  | 8,025 |  |  |  | 7,174 |  |  |  | 7,861 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale |  | $ | 81 |  |  | $ | 109 |  |  | $ | 64 |  |  | $ | 90 |
Long-term debt 3 |  |  | 4,326 |  |  |  | 4,882 |  |  |  | 4,525 |  |  |  | 4,891 |
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.
Schedule of Investment Securities |
|  | 2011 |  |  | 2010 |
December 31 |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
|  | In Millions |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 113 |  |  | $ | — |  |  | $ | — |  |  | $ | 113 |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | 62 |
State and municipal bonds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | 28 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 7 |  |  |  | — |  |  |  | — |  |  |  | 7 |  |  |  | 5 |  |  |  | 1 |  |  |  | — |  |  |  | 6 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 74 |  |  | $ | — |  |  | $ | — |  |  | $ | 74 |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |
State and municipal bonds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | 17 |
CMS Energy common stock |  |  | 7 |  |  |  | 28 |  |  |  | — |  |  |  | 35 |  |  |  | 8 |  |  |  | 26 |  |  |  | — |  |  |  | 34 |
Schedule of Proceeds and Gross Realized Gains/Losses from Sales of Available-for-Sale Securities | In Millions
Years Ended December 31 |  |  | 2011 |  |  |  | 2010 |  |  |  | 2009 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities 1 |  | $ | 29 |  |  | $ | 1 |  |  | $ | 53 |
Realized gains |  |  | - |  |  |  | - |  |  |  | 8 |
Net gains from AOCI recognized in net income |  |  | - |  |  |  | - |  |  |  | 5 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities 1 |  | $ | 19 |  |  | $ | - |  |  | $ | 32 |
Realized gains |  |  | - |  |  |  | - |  |  |  | 5 |
Net gains from AOCI recognized in net income |  |  | - |  |  |  | - |  |  |  | 3 |
1 | All proceeds related to sales of investments that were held within the SERP and classified as available for sale. Realized losses on these sales were less than $1 million for both CMS Energy and Consumers during each period.
Consumers Energy Company [Member] |
Schedule of Cost/Carrying Amounts and Fair Values of Long-Term Financial Instruments | In Millions
December 31 |  | 2011 |  |  | 2010 |
|  |  | Cost or Carrying Amount |  |  |  | Fair Value |  |  |  | Cost or Carrying Amount |  |  |  | Fair Value |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities held to maturity |  | $ | 7 |  |  | $ | 7 |  |  | $ | 5 |  |  | $ | 6 |
Securities available for sale |  |  | 113 |  |  |  | 113 |  |  |  | 90 |  |  |  | 90 |
Notes receivable 1 |  |  | 480 |  |  |  | 504 |  |  |  | 386 |  |  |  | 407 |
Long-term debt 2 |  |  | 7,073 |  |  |  | 8,025 |  |  |  | 7,174 |  |  |  | 7,861 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale |  | $ | 81 |  |  | $ | 109 |  |  | $ | 64 |  |  | $ | 90 |
Long-term debt 3 |  |  | 4,326 |  |  |  | 4,882 |  |  |  | 4,525 |  |  |  | 4,891 |
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.
Schedule of Investment Securities |
|  | 2011 |  |  | 2010 |
December 31 |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |  |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
|  | In Millions |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 113 |  |  | $ | — |  |  | $ | — |  |  | $ | 113 |  |  | $ | 62 |  |  | $ | — |  |  | $ | — |  |  | $ | 62 |
State and municipal bonds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 28 |  |  |  | — |  |  |  | — |  |  |  | 28 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 7 |  |  |  | — |  |  |  | — |  |  |  | 7 |  |  |  | 5 |  |  |  | 1 |  |  |  | — |  |  |  | 6 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SERP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 74 |  |  | $ | — |  |  | $ | — |  |  | $ | 74 |  |  | $ | 39 |  |  | $ | — |  |  | $ | — |  |  | $ | 39 |
State and municipal bonds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | 17 |
CMS Energy common stock |  |  | 7 |  |  |  | 28 |  |  |  | — |  |  |  | 35 |  |  |  | 8 |  |  |  | 26 |  |  |  | — |  |  |  | 34 |
Schedule of Proceeds and Gross Realized Gains/Losses from Sales of Available-for-Sale Securities | In Millions
Years Ended December 31 |  |  | 2011 |  |  |  | 2010 |  |  |  | 2009 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities 1 |  | $ | 29 |  |  | $ | 1 |  |  | $ | 53 |
Realized gains |  |  | - |  |  |  | - |  |  |  | 8 |
Net gains from AOCI recognized in net income |  |  | - |  |  |  | - |  |  |  | 5 |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of investment securities 1 |  | $ | 19 |  |  | $ | - |  |  | $ | 32 |
Realized gains |  |  | - |  |  |  | - |  |  |  | 5 |
Net gains from AOCI recognized in net income |  |  | - |  |  |  | - |  |  |  | 3 |
1 | All proceeds related to sales of investments that were held within the SERP and classified as available for sale. Realized losses on these sales were less than $1 million for both CMS Energy and Consumers during each period.

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13467-108611 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -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 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -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 investments in certain debt and equity securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes. A debt security represents a creditor relationship with an enterprise that is in the form of a security. 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 (and other trading assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 -Topic 320 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 -Topic 320 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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