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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
The components of inventory are as follows:
 
 
March 31,

 
December 31,

(MILLIONS OF DOLLARS)
 
2018

 
2017

Finished goods
 
$
770

 
$
788

Work-in-process
 
541

 
484

Raw materials and supplies
 
130

 
155

Inventories
 
$
1,441

 
$
1,427