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Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Current notes receivable $ 28 $ 49
Noncurrent notes receivable 512 462
Total notes receivable 540 511
Consumers Energy Company [Member]
   
Current notes receivable   23
Noncurrent notes receivable 26 1
Total notes receivable 26 24
EnerBank USA [Member]
   
Current notes receivable 27 19
Noncurrent notes receivable 486 461
Other [Member]
   
Current notes receivable 1 30
Noncurrent notes receivable $ 26 $ 1