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Related Party Transactions - Consumers (Tables)
 12 Months Ended
Dec. 31, 2021
Consumers Energy Company  
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions, by Related Party Table
Presented in the following table is Consumers’ expense recorded from related-party transactions for the years ended December 31:
In Millions
DescriptionRelated Party202120202019
Purchases of capacity and energyAffiliates of CMS Enterprises$77 $64 $75