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Income Taxes (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Income Taxes [Line Items] |  |  |
U.S. federal income tax rate |  | 35.00% | 35.00%
State and local income taxes, net of federal effect |  | 4.70% | 3.80%
Accelerated flow-through of regulatory tax benefits | [1] | (4.20%) | (4.60%)
Employee share-based awards |  | (1.40%) | (1.30%)
Other, net |  | (1.20%) | (1.50%)
Effective tax rate |  | 32.90% | 31.40%
Consumers Energy Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
U.S. federal income tax rate |  | 35.00% | 35.00%
State and local income taxes, net of federal effect |  | 4.60% | 4.60%
Accelerated flow-through of regulatory tax benefits | [1] | (4.00%) | (4.10%)
Employee share-based awards |  | (1.20%) | (1.20%)
Other, net |  | (1.60%) | (1.10%)
Effective tax rate |  | 32.80% | 33.20%
Reduction of income tax expense |  | $ 19 | $ 19
[1] | Since 2014, Consumers has followed a regulatory treatment ordered by the MPSC that accelerates the return of certain income tax benefits to customers. This change, which also accelerates Consumers' recognition of the income tax benefits, reduced Consumers' income tax expense by $19 million for the six months ended June 30, 2017 and 2016.

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to 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 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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=84230637&loc=d3e32687-109319 + Details
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