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Commitments and Contingent Liabilities (Tables)
 9 Months Ended
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Environmental Liabilities [Table Text Block]
Environmental Reserves
($ in millions)September 30, 2020December 31, 2019
New Jersey Chrome$99 $134 
Glass and chemical99 96 
Other91 74 
Total$289 $304 
Current portion$81 $62 
Environmental Costs [Table Text Block]
Pretax charges against income for environmental remediation costs are included in Other charges in the accompanying condensed consolidated statement of income. The pretax charges and cash outlays related to such environmental remediation for the three and nine months ended September 30, 2020 and 2019 were as follows:
Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2020201920202019
Environmental remediation pretax charges$6 $24 $21 $75 
Cash outlays for environmental remediation activities$15 $21 $52 $57