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Consolidated Statements of Changes in Equity (USD $) In Millions | Consumers Energy Company [Member] CMS Energy Common Stock [Member] | Consumers Energy Company [Member] Other Paid-in Capital [Member] | Consumers Energy Company [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Consumers Energy Company [Member] Retirement benefits liability [Member] | Consumers Energy Company [Member] Investments [Member] | Consumers Energy Company [Member] Retained Earnings (Accumulated Deficit) [Member] | Consumers Energy Company [Member] Preferred Stock [Member] | Consumers Energy Company [Member] | CMS Energy Common Stock [Member] | Other Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retirement benefits liability [Member] | Investments [Member] | Derivative instruments [Member] | Retained Earnings (Accumulated Deficit) [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Total Equity, beginning at Dec. 31, 2010 | $ 841 | $ 2,832 | $ 0 | $ (16) | $ 16 | $ 463 | $ 44 | $ 4,180 | $ 2 | $ 4,588 | $ (40) | $ (39) | $ 0 | $ (1) | $ (1,757) | $ 44 | $ 2,837
Common stock issued |  |  |  |  |  |  |  |  | 1 | 6 |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Stockholders contribution |  | 125 |  |  |  |  |  | 125 |  |  |  |  |  |  |  |  |
Retirement benefits liability adjustments, net of tax |  |  |  | 1 |  |  |  | (1) |  |  |  | 0 |  |  |  |  | 0
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (1) |  |  | (1) |  |  |  |  | 0 |  |  |  | 0
Net income |  |  |  |  |  | 153 |  | 153 |  |  |  |  |  |  | 135 |  | 135
Common stock dividends declared |  |  |  |  |  | (104) |  |  |  |  |  |  |  |  | (53) |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Total Equity, end at Mar. 31, 2011 | 841 | 2,957 | 0 | (15) | 15 | 512 | 44 | 4,354 | 3 | 4,599 | (40) | (39) | 0 | (1) | (1,675) | 44 | 2,931
Total Equity, beginning at Dec. 31, 2011 | 841 | 2,957 | (2) | (19) | 17 | 554 | 44 | 4,394 | 3 | 4,627 | (49) | (48) | 0 | (1) | (1,553) | 44 | 3,072
Common stock issued |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |
Common stock reissued |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Stockholders contribution |  | 150 |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |
Retirement benefits liability adjustments, net of tax |  |  |  | 1 |  |  |  | (1) |  |  |  | 1 |  |  |  |  | (1)
Unrealized gain (loss) on investments, net of tax |  |  |  |  | (3) |  |  | (3) |  |  |  |  | 1 |  |  |  | 1
Net income |  |  |  |  |  | 76 |  | 76 |  |  |  |  |  |  | 67 |  | 67
Common stock dividends declared |  |  |  |  |  | (115) |  |  |  |  |  |  |  |  | (62) |  |
Distributions and other changes in noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Total Equity, end at Mar. 31, 2012 | $ 841 | $ 3,107 | $ (4) | $ (18) | $ 14 | $ 515 | $ 44 | $ 4,503 | $ 3 | $ 4,641 | $ (47) | $ (47) | $ 1 | $ (1) | $ (1,548) | $ 44 | $ 3,093

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- Definition The after-tax amount of the change in the additional pension liability not yet recognized pursuant to FAS 87 par 37 and 38 as a net periodic pension cost. If the additional pension liability required to be recognized exceeds the unrecognized prior service costs, then the excess (which is the net loss not yet recognized as net periodic pension cost) is to be recorded as a reduction of other comprehensive income, before adjusting for tax effects. If in a subsequent measurement, the amount of minimum liability is eliminated or adjusted, this adjustment is offset against other comprehensive income in Accumulated Comprehensive Income. This line also includes changes in an entity's share of an equity investee's Increase or Decrease in additional pension liability not yet recognized as a net periodic pension cost. Eliminated upon adoption of FAS 158. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c(5) -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 158 -Paragraph 21 -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 AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 2 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 19, 20-25 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 + Details
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- Definition The cash inflow associated with the amount received by a corporation from a shareholder during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 95 -Paragraph 19 -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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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