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Property, Plant, and Equipment (Tables)
9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
($ in millions)September 30, 2021December 31, 2020
Land$14 $14 
Building600 647 
Machinery, equipment and office furnishings913 787 
Construction in progress317 356 
Less: accumulated depreciation(877)(820)
Property, Plant and Equipment, net$967 $984