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Income Taxes (Loss And Credit Carryforwards) (Details) $ in Millions | Dec. 31, 2016 USD ($)
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Operating Loss Carryforwards [Line Items] |
Total tax attributes | $ 871
Consumers Energy Company [Member] |
Operating Loss Carryforwards [Line Items] |
Total tax attributes | 190
Federal Tax Authority [Member] |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, Gross Amount | 1,415
Federal net operating loss carryforward, Tax Attribute | 495
Federal Tax Authority [Member] | Consumers Energy Company [Member] |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, Gross Amount | 447
Federal net operating loss carryforward, Tax Attribute | 157
Local Jurisdiction [Member] |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforward, Gross Amount | 408
Local net operating loss carryforwards, Tax Attribute | 4
Valuation Allowance - Loss carryforward | 2
Alternative Minimum Tax [Member] |
Operating Loss Carryforwards [Line Items] |
Tax credits, Gross Amount | 270
Alternative minimum tax credits, Tax Attribute | 270
General Business Tax Credit Carryforward [Member] |
Operating Loss Carryforwards [Line Items] |
Tax credits, Gross Amount | 102
General business credits, Tax Attribute | 102
Valuation Allowance - Loss carryforward | 3
General Business Tax Credit Carryforward [Member] | Consumers Energy Company [Member] |
Operating Loss Carryforwards [Line Items] |
Tax credits, Gross Amount | 33
General business credits, Tax Attribute | $ 33

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards and deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: 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=65882285&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 3: 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=65882285&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: 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=65882285&loc=d3e32632-109319 Reference 2: 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=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: 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=65882285&loc=d3e32632-109319 Reference 4: 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=65882285&loc=d3e32621-109319 + Details
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