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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Warranty accrual rollforward
                         
    Year Ended
December 31,
 
    2011     2010     2009  
    (Millions)  

Beginning Balance

  $ 33     $ 32     $ 27  

Accruals related to product warranties

    11       19       18  

Reductions for payments made

    (18     (18     (13
   

 

 

   

 

 

   

 

 

 

Ending Balance

  $ 26     $ 33     $ 32