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Regulatory Matters (Schedule Of The Components Of Regulatory Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Consumers Energy Company [Member] | Dec. 31, 2012 Consumers Energy Company [Member] | Dec. 31, 2013 Cost Of Removal [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Cost Of Removal [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Renewable Energy Plan [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Renewable Energy Plan [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Income Taxes, Net [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Income Taxes, Net [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Postretirement Benefits [Member] Consumers Energy Company [Member] | Dec. 31, 2013 ARO [Member] Consumers Energy Company [Member] | Dec. 31, 2012 ARO [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Renewable Energy Grant [Member] Consumers Energy Company [Member] | Jan. 31, 2013 Renewable Energy Grant [Member] Consumers Energy Company [Member] | Dec. 31, 2013 DOE Settlement [Member] Consumers Energy Company [Member] | Dec. 31, 2012 DOE Settlement [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Energy Optimization Plan [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Energy Optimization Plan [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Other Regulatory Liabilities [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Other Regulatory Liabilities [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Postretirement Benefits [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Postretirement Benefits [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Costs Of Electric Generating Units To Be Retired And Securitized [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Manufactured Gas Plant [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Manufactured Gas Plant [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Other Securitized Costs [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Other Securitized Costs [Member] Consumers Energy Company [Member] | Dec. 31, 2013 ARO [Member] Consumers Energy Company [Member] | Dec. 31, 2012 ARO [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Unamortized Debt Costs [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Unamortized Debt Costs [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Gas Storage Inventory Adjustments [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Gas Storage Inventory Adjustments [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Energy Optimization Plan Incentive [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Energy Optimization Plan Incentive [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Major Maintenance [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Major Maintenance [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Cancelled Coal-Fueled Plant Costs [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Cancelled Coal-Fueled Plant Costs [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Gas Revenue Decoupling Mechanism [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Gas Revenue Decoupling Mechanism [Member] Consumers Energy Company [Member] | Dec. 31, 2013 Other Regulatory Assets [Member] Consumers Energy Company [Member] | Dec. 31, 2012 Other Regulatory Assets [Member] Consumers Energy Company [Member]
Regulatory Matters [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Current Asset, End Date for Recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2014 | [1] |  |  |  |  |  |  | 2014 | [2] |  |  | 2014 | [1] |  |  | 2014 | [2] |  |
Noncurrent Regulatory Asset Recovery End Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2029 | [2] |  |  |  |  | 2016 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2015 | [1] |  |  |  |  |  |  | 2015 | [2] |  |  | 2014 | [1] |  |  |  |  |  |
Current Regulatory Liability Recovery End Date |  |  |  |  |  |  |  |  | 2014 |  |  |  |  | 2014 |  | 2013 |  |  |  | 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent Regulatory Liability, Recovery End Date |  |  |  |  |  |  | 2028 |  |  |  |  |  |  | 2043 |  |  |  | 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets, current | $ 40 | $ 35 | $ 40 | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 | [1] | $ 15 | [1] |  |  |  |  | $ 5 | [2] | $ 4 | [2] | $ 17 | [1] | $ 16 | [1] | $ 1 | [2] |  |
Regulatory assets, noncurrent | 1,530 | 2,287 | 1,530 | 2,287 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 634 | [3] | 1,700 | [3] | 362 | [2] | 148 | [4] | 152 | [4] | 129 | [2] | 192 | [2] | 129 | [4] | 123 | [4] | 74 | [4] | 55 | [4] | 23 | [4] | 15 | [4] | 18 | [1] | 17 | [1] | 10 | [2] | 5 | [2] | 2 | [2] | 7 | [2] |  |  | 17 | [1] | 1 | [2] | 4 | [2]
Total regulatory asset |  |  | 1,570 | 2,322 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities, current | 67 | 25 | 67 | 25 |  |  |  |  | 64 |  |  |  |  | 2 |  |  | 23 |  |  | 1 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities, noncurrent | 2,215 | 2,101 | 2,215 | 2,101 | 1,599 | 1,441 | 159 | 175 | 157 | 336 | 98 | 93 | 103 | 65 |  |  |  | 31 | 34 | 13 | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total regulatory liabilities |  |  | $ 2,282 | $ 2,126 |  |  |  |  |  |  |  |  |  |  | $ 69 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | These regulatory assets have arisen from alternative revenue programs and are not associated with incurred costs or capital investments. Therefore, the MPSC has provided for recovery without a return.
[2] | These regulatory assets either are included in rate base (or are expected to be included, for costs incurred subsequent to the most recently approved rate case), thereby providing a return on expenditures, or provide a specific return on investment authorized by the MPSC.
[3] | This regulatory asset is offset partially by liabilities. The net amount is included in rate base, thereby providing a return.
[4] | These regulatory assets represent incurred costs for which the MPSC has provided, or Consumers expects, recovery without a return on investment.

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- Definition The end date for recovery of the individual regulatory current liability in a schedule of regulatory current liabilities. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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