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Related Party Transactions - Consumers (Tables)
 12 Months Ended
Dec. 31, 2018
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
 
Description
Related Party
2018
 
2017
 
2016
 
Purchases of capacity and energy
Affiliates of CMS Enterprises
 
$
83

 
$
90

 
$
88