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v3.23.1

Contingencies and Commitments (Summary of Guarantees) (Details) $ in Millions | 3 Months Ended
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Mar. 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 | $ 318
Carrying Amount | $ 0
Indemnity obligations from stock and asset sale agreements |
Guarantees And Other Contingencies [Line Items] |
Expiration Date | indefinite
Maximum Obligation | $ 226
Carrying Amount | $ 3

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