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Income Taxes (Tables) | 3 Months Ended
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Mar. 31, 2012
Schedule of Effective Income Tax Rate Reconciliation |
Three Months Ended March 31 |  |  |  | 2012 |  |  |  |  | 2011 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  |  |  |  | 35.0% |  |  |  |  |  | 35.0% |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal benefit |  |  |  |  | 4.2 |  |  |  |  |  | 3.4 |
Medicare Part D exempt income |  |  |  |  | 0.1 |  |  |  |  |  | (1.2) |
Income tax credit amortization |  |  |  |  | (0.5) |  |  |  |  |  | (0.6) |
Other, net |  |  |  |  | - |  |  |  |  |  | 0.1 |
Effective income tax rate |  |  |  |  | 38.8% |  |  |  |  |  | 36.7% |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  |  |  |  | 35.0% |  |  |  |  |  | 35.0% |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal benefit |  |  |  |  | 5.6 |  |  |  |  |  | 3.5 |
Medicare Part D exempt income |  |  |  |  | 0.5 |  |  |  |  |  | (0.9) |
Plant basis differences |  |  |  |  | (0.8) |  |  |  |  |  | (0.2) |
Income tax credit amortization |  |  |  |  | (0.4) |  |  |  |  |  | (0.4) |
Other, net |  |  |  |  | 0.7 |  |  |  |  |  | 0.2 |
Effective income tax rate |  |  |  |  | 40.6% |  |  |  |  |  | 37.2% |
Consumers Energy Company [Member] |
Schedule of Effective Income Tax Rate Reconciliation |
Three Months Ended March 31 |  |  |  | 2012 |  |  |  |  | 2011 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  |  |  |  | 35.0% |  |  |  |  |  | 35.0% |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal benefit |  |  |  |  | 4.2 |  |  |  |  |  | 3.4 |
Medicare Part D exempt income |  |  |  |  | 0.1 |  |  |  |  |  | (1.2) |
Income tax credit amortization |  |  |  |  | (0.5) |  |  |  |  |  | (0.6) |
Other, net |  |  |  |  | - |  |  |  |  |  | 0.1 |
Effective income tax rate |  |  |  |  | 38.8% |  |  |  |  |  | 36.7% |
CONSUMERS |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal income tax rate |  |  |  |  | 35.0% |  |  |  |  |  | 35.0% |
Increase (decrease) in income taxes from: |  |  |  |  |  |  |  |  |  |  |  |
State and local income taxes, net of federal benefit |  |  |  |  | 5.6 |  |  |  |  |  | 3.5 |
Medicare Part D exempt income |  |  |  |  | 0.5 |  |  |  |  |  | (0.9) |
Plant basis differences |  |  |  |  | (0.8) |  |  |  |  |  | (0.2) |
Income tax credit amortization |  |  |  |  | (0.4) |  |  |  |  |  | (0.4) |
Other, net |  |  |  |  | 0.7 |  |  |  |  |  | 0.2 |
Effective income tax rate |  |  |  |  | 40.6% |  |  |  |  |  | 37.2% |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 740 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 12 -Section 50 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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