Other Property and Equipment Other Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Other Property and Equipment - Held for Use and Useful Life

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

	December 31,						Estimated Useful Life
	2016			2015
	($ in millions)						(in years)
Buildings and improvements	$	1,119		$	1,209		10 – 39
Computer equipment	337			318			5
Natural gas compressors(a)	251			483			3 – 20
Land	139			289
Gathering systems and treating plants(a)	2			214			20
Other	205			414			2 – 20
Total other property and equipment, at cost	2,053			2,927
Less: accumulated depreciation	(632		)	(813		)
Total other property and equipment, net	$	1,421		$	2,114

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(a) Included in our marketing, gathering and compression operating segment. The decrease is primarily related to asset divestitures in 2016.

A summary by asset class of (gains) or losses on sales of fixed assets for the years ended December 31, 2016, 2015 and 2014 is as follows:

	Years Ended December 31,
	2016			2015		2014
	($ in millions)
Buildings and land	$	(1	)	$	3	$	(2	)
Natural gas compressors	(10		)	—		(195		)
Gathering systems and treating plants	—			1		8
Oilfield services equipment	—			—		(7		)
Other	(1		)	—		(3		)
Total net (gains) losses on sales of fixed assets	$	(12	)	$	4	$	(199	)

Other Property and Equipment - Net (Gains) Losses on Sales of Fixed Assets

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

	December 31,						Estimated Useful Life
	2016			2015
	($ in millions)						(in years)
Buildings and improvements	$	1,119		$	1,209		10 – 39
Computer equipment	337			318			5
Natural gas compressors(a)	251			483			3 – 20
Land	139			289
Gathering systems and treating plants(a)	2			214			20
Other	205			414			2 – 20
Total other property and equipment, at cost	2,053			2,927
Less: accumulated depreciation	(632		)	(813		)
Total other property and equipment, net	$	1,421		$	2,114

___________________________________________

(a) Included in our marketing, gathering and compression operating segment. The decrease is primarily related to asset divestitures in 2016.

A summary by asset class of (gains) or losses on sales of fixed assets for the years ended December 31, 2016, 2015 and 2014 is as follows:

	Years Ended December 31,
	2016			2015		2014
	($ in millions)
Buildings and land	$	(1	)	$	3	$	(2	)
Natural gas compressors	(10		)	—		(195		)
Gathering systems and treating plants	—			1		8
Oilfield services equipment	—			—		(7		)
Other	(1		)	—		(3		)
Total net (gains) losses on sales of fixed assets	$	(12	)	$	4	$	(199	)