Other Property and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Other Property and Equipment

Other Property and Equipment

Other Property and Equipment

A summary of other property and equipment held for use and the estimated useful lives thereof is as follows:

	December 31,						Estimated Useful Life
	2018			2017
	($ in millions)						(in years)
Buildings and improvements	$	1,053		$	1,093		10 – 39
Computer equipment	353			345			5
Natural gas compressors(a)	48			235			3 – 20
Land	106			126
Other	161			187			5 – 20
Total other property and equipment, at cost	1,721			1,986
Less: accumulated depreciation	(630		)	(672		)
Total other property and equipment, net	$	1,091		$	1,314

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(a) Includes assets under capital lease of $27 million, less accumulated depreciation of $1 million, as of December 31, 2018. The related amortization expense for assets under capital lease is included in depreciation, depletion and amortization expense on our consolidated statement of operations.