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Commitments and Contingent Liabilities (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Environmental Liabilities [Table Text Block]
Environmental Reserves
($ in millions)September 30, 2021December 31, 2020
New Jersey Chrome$94 $102 
Glass and chemical111 106 
Other96 92 
Total$301 $300 
Current portion$96 $99 
Environmental Costs [Table Text Block]
Pretax charges against income for environmental remediation costs are included in Other charges in the accompanying condensed consolidated statement of income. The pretax charges and cash outlays related to such environmental remediation for the three and nine months ended September 30, 2021 and 2020 were as follows:
Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2021202020212020
Environmental remediation pretax charges$5 $6 $36 $21 
Cash outlays for environmental remediation activities$17 $15 $34 $52