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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2012
Commitments and Contingencies  
Accrued Liabilities and Insurance Receivables Related to Legal Proceedings
Liability and Receivable Balances      
(Millions)  June 30, 2012  Dec. 31, 2011
     
Respirator mask/asbestos liabilities  $ 160 $ 130
Respirator mask/asbestos insurance receivables    136   121
       
Environmental remediation liabilities  $ 28 $ 28
Environmental remediation insurance receivables    15   15
       
Other environmental liabilities  $ 66 $ 75