Properties and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Properties and Equipment, at Cost

Properties and equipment is carried at cost and consists of the following:

	Estimated Useful Life(a) (Years)	December 31,
		2019		2018
		(Millions)
Proved properties	(b)	$	8,719	$	7,289
Unproved properties and land	(c)	1,765		1,891
Gathering, processing and other facilities	15-25	403		294
Construction in progress	(c)	224		350
Other	3-40	133		125
Total properties and equipment, at cost		11,244		9,949
Accumulated depreciation, depletion and amortization		(3,654)		(2,683)
Properties and equipment—net		$	7,590	$	7,266

__________

(a) Estimated useful lives are presented as of December 31, 2019.

(b) Proved properties are depreciated, depleted and amortized using the units-of-production method (see Note 1).

(c) Unproved properties, land and construction in progress are not subject to depreciation and depletion.

Rollforward of Asset Retirement Obligation

A rollforward of our asset retirement obligations for the years ended 2019 and 2018 is presented below.

	2019		2018
	(Millions)
Balance, January 1	$	72	$	39
Liabilities incurred	11		8
Liabilities settled	(4)		(7)
Estimate revisions	14		30
Accretion expense(a)	4		2
Balance, December 31	$	97	$	72
Amount reflected as current	$	5	$	5

__________

(a) Accretion expense is included in lease and facility operating expense on the Consolidated Statements of Operations.