XML 28 R27.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Income Taxes (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2015
Schedule Of Effective Income Tax Rate Reconciliation |
Three Months Ended March 31 | 2015 |  | 2014 |  |
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 effect |  | 4.8 |  |  | 4.9 |  |
Accelerated flow-through of regulatory tax benefits |  | (4.9) |  |  | (5.4) |  |
Other, net |  | (1.8) |  |  | (0.5) |  |
Effective tax rate |  | 33.1 | % |  | 34.0 | % |
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 effect |  | 4.7 |  |  | 4.9 |  |
Accelerated flow-through of regulatory tax benefits |  | (4.4) |  |  | (4.8) |  |
Other, net |  | (1.5) |  |  | (0.7) |  |
Effective tax rate |  | 33.8 | % |  | 34.4 | % |
Consumers Energy Company [Member] |
Schedule Of Effective Income Tax Rate Reconciliation |
Three Months Ended March 31 | 2015 |  | 2014 |  |
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 effect |  | 4.8 |  |  | 4.9 |  |
Accelerated flow-through of regulatory tax benefits |  | (4.9) |  |  | (5.4) |  |
Other, net |  | (1.8) |  |  | (0.5) |  |
Effective tax rate |  | 33.1 | % |  | 34.0 | % |
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 effect |  | 4.7 |  |  | 4.9 |  |
Accelerated flow-through of regulatory tax benefits |  | (4.4) |  |  | (4.8) |  |
Other, net |  | (1.5) |  |  | (0.7) |  |
Effective tax rate |  | 33.8 | % |  | 34.4 | % |

X
- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cms_ConsumersEnergyCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |