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Property, plant and equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, plant and equipment Property, plant and equipment
 
 December 31,
(Millions of dollars)Useful
Lives (Years)		20212020
Land—$648 $681 
Buildings and land improvements
20-45
7,113 7,091 
Machinery, equipment and other
2-10
12,868 13,004 
Software
3-7
1,697 1,679 
Equipment leased to others
1-7
5,733 6,077 
Construction-in-process—812 739 
Total property, plant and equipment, at cost 28,871 29,271 
Less: Accumulated depreciation (16,781)(16,870)
Property, plant and equipment–net $12,090 $12,401