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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current notes receivable $ 41 $ 49
Total notes receivable 561 511
Consumers Energy Company [Member]
   
Current notes receivable   23
Total notes receivable 16 24
EnerBank [Member]
   
Current notes receivable 40 19
Noncurrent notes receivable 504 461
Other [Member]
   
Current notes receivable 1 30
Noncurrent notes receivable 16 1
Other [Member] | Consumers Energy Company [Member]
   
Current notes receivable   23
Noncurrent notes receivable $ 16 $ 1