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Regulatory Matters (Tables) (Consumers Energy Company [Member])
6 Months Ended
Jun. 30, 2011
Electric Rate Case [Member]
 
Components of Requested Annual Rate Increase
         
In Millions  
Components of the increase in revenue        
 
Investment in rate base
  $ 81  
Recovery of depreciation and property taxes
    70  
Impact of sales declines
    50  
Reduced operating and maintenance costs
    (4 )
Cost of capital
    (2 )
 
Total
  $ 195  
 
Power Supply Cost Recover (PSCR) [Member]
 
Reconciliation Filings Pending with MPSC
                       
 
PSCR Year   Date Filed     Net Underrecovery     PSCR Cost of Power Sold  
 
2010
  March 2011     $   15 million     $   1.7 billion  
 
Gas Cost Recover (GCR) [Member]
 
Reconciliation Filings Pending with MPSC
                         
 
GCR Year   Date Filed     Net Overrecovery     GCR Cost of Gas Sold  
 
2009-2010
  June 2010     $   1 million     $   1.3 billion  
2010-2011
  June 2011     6 million     1.2 billion  
 
Gas Rate Case [Member]
 
Schedule Of Rate Increase Authorized And Requested
                         
In Millions  
            Increase Originally        
    Increase Authorized     Requested by        
Components of the increase in revenue   by the MPSC     Consumers     Difference  
 
Investment in rate base
  $ 29     $ 30     $ (1 )
Impact of sales declines
    15       4       11  
Recovery of operating and maintenance costs
    2       16       (14 )
Cost of capital
    (15 )     5       (20 )
 
Total
  $ 31     $ 55     $ (24 )