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Property, Plant & Equipment - Net
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant & Equipment - Net PROPERTY, PLANT AND EQUIPMENT – NET
Significant classes of property, plant and equipment are as follows:
(Millions of dollars)
December 31,
 
Depreciable Lives (Yrs)
 
2019
 
2018
Production plants (primarily 15-year life) (a)
 
10-20
 
$
25,493

 
$
24,726

Storage tanks
 
15-20
 
4,295

 
4,061

Transportation equipment and other
 
3-15
 
2,809

 
2,654

Cylinders
 
10-30
 
4,184

 
3,955

Buildings
 
25-40
 
3,162

 
3,083

Land and improvements (b)
 
0-20
 
1,229

 
1,162

Construction in progress
 
 
 
3,146

 
2,296

 
 
 
 
44,318

 
41,937

Less: accumulated depreciation
 
 
 
(15,254
)
 
(12,220
)
 
 
 
 
$
29,064

 
$
29,717


(a) - Depreciable lives of production plants related to long-term customer supply contracts are consistent with the contract lives.
(b) - Land is not depreciated.