Other Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Summary of other property and equipment held for use and estimated useful lives

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

	December 31,				Estimated Useful Life
	2019		2018
	($ in millions)				(in years)
Buildings and improvements	$	1,058	$	1,053	10 – 39
Computer equipment	355		353		5
Sand mine	78		—		10 – 30
Natural gas compressors(a)	48		48		3 – 20
Land	115		106
Other	156		161		5 – 20
Total other property and equipment, at cost	1,810		1,721
Less: accumulated depreciation	(692)		(630)
Total other property and equipment, net	$	1,118	$	1,091

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(a)    Includes assets under finance lease of $27 million, less accumulated depreciation of $10 million and $1 million, as of December 31, 2019 and 2018, respectively. The related amortization expense for assets under finance lease is included in depreciation, depletion and amortization expense on our consolidated statement of operations.