Property, Plant, and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property, plant, and equipment

Property, plant, and equipment were composed of the following:

	December 31
Millions of dollars	2013		2012
Land	$	213	$	145
Buildings and property improvements	2,685		1,861
Machinery, equipment, and other	17,904		16,307
Total	20,802		18,313
Less accumulated depreciation	9,480		8,056
Net property, plant, and equipment	$	11,322	$	10,257

Percentages of building and property improvements, and total machinery, and equipment and other, excluding oil and natural gas investments, depreciated over useful lives

Classes of assets, excluding oil and natural gas investments, are depreciated over the following useful lives:

	Buildings and Property Improvements
	2013	2012
1    -   10 years	13%	14%
11    -   20 years	43%	46%
21    -   30 years	20%	14%
31    -   40 years	24%	26%

	Machinery, Equipment, and Other
	2013	2012
1    -    5 years	22%	20%
6    -   10 years	72%	74%
11    -   20 years	6%	6%