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Related Party Transactions - Consumers (Tables) (Consumers Energy Company [Member])
12 Months Ended
Dec. 31, 2011
Consumers Energy Company [Member]
 
Schedule of Related Party Transactions, by Related Party Table

In Millions

 

Description

     Related Party         2011         2010         2009   

Purchases of capacity and energy

     Affiliates of CMS Enterprises       $ 81       $ 84       $ 81