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Income Taxes (Details) | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
U.S. federal income tax rate | 35.00% | 35.00%
State and local income taxes, net of federal effect | 4.80% | 5.00%
Accelerated flow-through of regulatory tax benefits | (4.90%) | (5.40%)
Other, net | (1.30%) | (0.60%)
Effective tax rate | 33.60% | 34.00%
Consumers Energy Company [Member] |  |
U.S. federal income tax rate | 35.00% | 35.00%
State and local income taxes, net of federal effect | 4.80% | 4.90%
Accelerated flow-through of regulatory tax benefits | (4.30%) | (4.50%)
Other, net | (1.50%) | (0.60%)
Effective tax rate | 34.00% | 34.80%

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