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Environmental Matters, Litigation and Product Warranties (Tables)
9 Months Ended
Sep. 30, 2011
Environmental Matters, Litigation and Product Warranties [Abstract] 
Warranty accrual rollforward
 
                 
    Nine Months
 		 
    Ended
 		 
    September 30,  
    2011     2010  
    (Millions)  
 
Beginning Balance January 1,
  $ 33     $ 32  
Accruals related to product warranties
    7       13  
Reductions for payments made
    (13 )     (12 )
                 
Ending Balance September 30,
  $ 27     $ 33