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Income Taxes (Loss And Credit Carryforwards) (Details) $ in Millions | Dec. 31, 2015 USD ($)
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Operating Loss Carryforwards [Line Items] |
Total tax attributes | $ 657
Consumers Energy Company [Member] |
Operating Loss Carryforwards [Line Items] |
Total tax attributes | 46
Federal Tax Authority [Member] |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, Gross Amount | 885
Federal net operating loss carryforward, Tax Attribute | 311
Federal Tax Authority [Member] | Consumers Energy Company [Member] |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, Gross Amount | 121
Federal net operating loss carryforward, Tax Attribute | 42
Local Jurisdiction [Member] |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, Gross Amount | 414
Local net operating loss carryforwards, Tax Attribute | 4
Valuation Allowance - Loss carryforward | 1
Alternative Minimum Tax [Member] |
Operating Loss Carryforwards [Line Items] |
Tax credits, Gross Amount | 270
Alternative minimum tax credits, Tax Attribute | 270
Charitable Contribution Carryover [Member] |
Operating Loss Carryforwards [Line Items] |
Charitable contribution carryforwards | 2
Charitable contribution carryover, Tax Attribute | 1
Charitable Contribution Carryover [Member] | Consumers Energy Company [Member] |
Operating Loss Carryforwards [Line Items] |
Charitable contribution carryforwards | 2
Charitable contribution carryover, Tax Attribute | 1
General Business Tax Credit Carryforward [Member] |
Operating Loss Carryforwards [Line Items] |
Tax credits, Gross Amount | 71
General business credits, Tax Attribute | 71
Valuation Allowance - Loss carryforward | 3
General Business Tax Credit Carryforward [Member] | Consumers Energy Company [Member] |
Operating Loss Carryforwards [Line Items] |
Tax credits, Gross Amount | 3
General business credits, Tax Attribute | $ 3

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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