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Asset Retirement Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Asset Retirement Obligations [Line Items] |  |
ARO Liability, at beginning of period | $ 340 | $ 325
Incurred | 11 | 9
Settled | (6) | (12)
Accretion | 20 | $ 18
Cash flow Revisions | 74 |
ARO Liability, end of period | 439 | $ 340
Consumers Energy Company [Member] |  |
Asset Retirement Obligations [Line Items] |  |
ARO Liability, at beginning of period | 339 | 324
Incurred | 11 | 9
Settled | (6) | (12)
Accretion | 20 | $ 18
Cash flow Revisions | 74 |
ARO Liability, end of period | 438 | $ 339
Gas Treating Plant and Gas Wells [Member] |  |
Asset Retirement Obligations [Line Items] |  |
ARO Liability, at beginning of period | $ 1 | $ 1
Incurred |  |
Settled |  |
Accretion |  |
Cash flow Revisions |  |
ARO Liability, end of period | $ 1 | $ 1
Coal Ash Disposal Areas [Member] | Consumers Energy Company [Member] |  |
Asset Retirement Obligations [Line Items] |  |
ARO Liability, at beginning of period | 120 | 118
Settled |  | (3)
Accretion | 6 | $ 5
Cash flow Revisions | 74 |
ARO Liability, end of period | 200 | $ 120
Gas Distribution Cut, Purge, Cap [Member] | Consumers Energy Company [Member] |  |
Asset Retirement Obligations [Line Items] |  |
ARO Liability, at beginning of period | 162 | 154
Incurred | 11 | 6
Settled | (6) | (8)
Accretion | 11 | $ 10
Cash flow Revisions |  |
ARO Liability, end of period | 178 | $ 162
Asbestos Abatement [Member] | Consumers Energy Company [Member] |  |
Asset Retirement Obligations [Line Items] |  |
ARO Liability, at beginning of period | 51 | 49
Settled |  | (1)
Accretion | 3 | $ 3
Cash flow Revisions |  |
ARO Liability, end of period | 54 | $ 51
Wind Parks [Member] | Consumers Energy Company [Member] |  |
Asset Retirement Obligations [Line Items] |  |
ARO Liability, at beginning of period | $ 6 | 3
Incurred |  | $ 3
Settled |  |
Accretion |  |
Cash flow Revisions |  |
ARO Liability, end of period | $ 6 | $ 6

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- Definition Asset Retirement Obligations [Line Items] + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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