Property, Plant, and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, Plant, and Equipment

Property, Plant and Equipment

Property, plant and equipment were composed of the following:

	December 31
Millions of dollars	2018		2017
Land	$	252	$	248
Buildings and property improvements	3,461		3,460
Machinery, equipment and other	18,430		17,062
Total	22,143		20,770
Less accumulated depreciation	13,182		12,249
Net property, plant and equipment	$	8,961	$	8,521

Classes of assets are depreciated over the following useful lives:

	Buildings and Property Improvements
	2018	2017
1    -   10 years	11%	11%
11    -   20 years	42%	42%
21    -   30 years	23%	22%
31    -   40 years	25%	25%

	Machinery, Equipment and Other
	2018	2017
1    -    5 years	34%	35%
6    -   10 years	56%	56%
11    -   20 years	10%	9%