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Property, Plant And Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant And Equipment PROPERTY, PLANT AND EQUIPMENT
The classes of property, plant and equipment as of December 31 are summarized as follows ($ in millions):
20202019
Land and improvements$192 $149 
Buildings1,522 954 
Machinery and equipment2,881 2,194 
Customer-leased equipment1,849 1,766 
Gross property, plant and equipment6,444 5,063 
Less: accumulated depreciation3,182 2,761 
Property, plant and equipment, net$3,262 $2,302