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Income Taxes (Details) | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
U.S. federal income tax rate | 35.00% | 35.00%
State and local income taxes, net of federal effect | 5.00% | 4.90%
Accelerated flow-through of regulatory tax benefits | (5.40%) |
Other, net | (0.60%) |
Effective tax rate | 34.00% | 39.90%
Consumers Energy Company [Member] |  |
U.S. federal income tax rate | 35.00% | 35.00%
State and local income taxes, net of federal effect | 4.90% | 4.80%
Accelerated flow-through of regulatory tax benefits | (4.50%) |
Other, net | (0.60%) | (0.40%)
Effective tax rate | 34.80% | 39.40%

X
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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