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Landfill and Environmental Remediation Liabilities (Tables)
 3 Months Ended
Jun. 30, 2012
Landfill and Environmental Remediation Liabilities [Abstract]  
Liabilities for landfill and environmental remediation costs
                                                 
    June 30, 2012     December 31, 2011  
    Landfill     Environmental
Remediation		     Total     Landfill     Environmental
Remediation		     Total  

Current (in accrued liabilities)

   $ 119     $ 37     $ 156     $ 123     $ 38     $ 161  

Long-term

     1,210       227       1,437       1,169       235       1,404  
   

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

  
    $ 1,329     $ 264     $ 1,593     $ 1,292     $ 273     $ 1,565  
   

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

  
Changes to landfill and environmental remediation liabilities
                 
    Landfill     Environmental
Remediation		  

December 31, 2010

   $ 1,266     $ 284  

Obligations incurred and capitalized

     49       —  

Obligations settled

     (80 )      (37 ) 

Interest accretion

     84       6  

Revisions in cost estimates and interest rate assumptions

     (30 )      23  

Acquisitions, divestitures and other adjustments

     3       (3 ) 
   

 

 

    

 

 

  

December 31, 2011

     1,292       273  

Obligations incurred and capitalized

     28       —  

Obligations settled

     (31 )      (14 ) 

Interest accretion

     41       2  

Revisions in cost estimates and interest rate assumptions

     1       3  

Acquisitions, divestitures and other adjustments

     (2 )      —  
   

 

 

    

 

 

  

June 30, 2012

   $ 1,329     $ 264