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Contingencies and Commitments (Summary of Guarantees) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($)
Variable Interest Entity, Primary Beneficiary | Aviator Wind Class B Membership |
Guarantees And Other Contingencies [Line Items] |
Ownership percentage | 49.00%
Guarantees |
Guarantees And Other Contingencies [Line Items] |
Expiration Date | indefinite
Maximum Obligation | $ 30
Carrying Amount | $ 0
Guarantees | Consumers Energy Company |
Guarantees And Other Contingencies [Line Items] |
Expiration Date | indefinite
Maximum Obligation | $ 30
Carrying Amount | $ 0
Indemnification agreement from sale of membership interests in VIEs |
Guarantees And Other Contingencies [Line Items] |
Expiration Date | indefinite
Maximum Obligation | $ 304
Carrying Amount | $ 0
Indemnity obligations from stock and asset sale agreements |
Guarantees And Other Contingencies [Line Items] |
Expiration Date | indefinite
Maximum Obligation | $ 153
Carrying Amount | $ 1

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 + Details
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