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Property, Plant & Equipment - Net (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant & Equipment - Net
Significant classes of property, plant and equipment are as follows:
(Millions of dollars)
December 31,
Depreciable Lives (Yrs)20202019
Production plants (primarily 15-year life) (a)
10-20
$28,226 $25,493 
Storage tanks
15-20
4,461 4,295 
Transportation equipment and other
3-15
2,978 2,809 
Cylinders
10-30
4,491 4,184 
Buildings
25-40
3,327 3,162 
Land and improvements (b)
0-20
1,259 1,229 
Construction in progress3,257 3,146 
47,999 44,318 
Less: accumulated depreciation(19,288)(15,254)
$28,711 $29,064 
(a) - Depreciable lives of production plants related to long-term customer supply contracts are generally consistent with the contract lives.
(b) - Land is not depreciated.