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Asset Retirement Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | $ 746 | $ 628
Incurred | 11 | 1
Settled | (28) | (39)
Accretion | 33 | 28
Cash Flow Revisions | 9 | 128
ARO Liability, end of period | 771 | 746
Consumers Energy Company |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | 722 | 605
Incurred | 4 | 1
Settled | (28) | (39)
Accretion | 32 | 27
Cash Flow Revisions | 9 | 128
ARO Liability, end of period | 739 | 722
Renewable generation assets |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | 24 | 23
Incurred | 7 | 0
Settled | 0 | 0
Accretion | 1 | 1
Cash Flow Revisions | 0 | 0
ARO Liability, end of period | 32 | 24
Renewable generation assets | Consumers Energy Company |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | 95 | 93
Incurred | 4 | 0
Settled | 0 | 0
Accretion | 3 | 2
Cash Flow Revisions | 0 | 0
ARO Liability, end of period | 102 | 95
Coal ash disposal areas | Consumers Energy Company |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | 272 | 157
Incurred | 0 | 0
Settled | (15) | (20)
Accretion | 11 | 7
Cash Flow Revisions | 0 | 128
ARO Liability, end of period | 268 | 272
Gas distribution cut, purge, and cap | Consumers Energy Company |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | 287 | 282
Incurred | 0 | 1
Settled | (10) | (11)
Accretion | 14 | 15
Cash Flow Revisions | (1) | 0
ARO Liability, end of period | 290 | 287
Asbestos abatement | Consumers Energy Company |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | 39 | 38
Incurred | 0 | 0
Settled | (1) | (1)
Accretion | 3 | 2
Cash Flow Revisions | 10 | 0
ARO Liability, end of period | 51 | 39
Gas wells plug and abandon | Consumers Energy Company |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
ARO Liability, at beginning of period | 29 | 35
Incurred | 0 | 0
Settled | (2) | (7)
Accretion | 1 | 1
Cash Flow Revisions | 0 | 0
ARO Liability, end of period | $ 28 | $ 29

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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/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + 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/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + 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/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from 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/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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