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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Components of Inventory The components of inventory are as follows:
 
 
March 31,
 
December 31,
(MILLIONS OF DOLLARS)
 
2019
 
2018
Finished goods
 
$
655

 
$
744

Work-in-process
 
523

 
481

Raw materials and supplies
 
183

 
166

Inventories
 
$
1,361

 
$
1,391