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Contingencies and Commitments (Summary of Guarantees) (Details)
$ in Millions
12 Months Ended
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