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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2017
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
The Company's asset retirement obligations primarily relate to the future plugging and abandonment of wells and related facilities. The following table summarizes the Company's asset retirement obligation activity during the three and nine months ended September 30, 2017 and 2016: 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Beginning asset retirement obligations
$
294

 
$
281

 
$
297

 
$
285

Liabilities assumed in acquisitions
—

 
3

 
—

 
3

New wells placed on production
—

 
—

 
2

 
—

Changes in estimates
—

 
—

 
7

 
—

Dispositions
—

 
—

 
(7
)
 
—

Liabilities settled
(7
)
 
(8
)
 
(21
)
 
(21
)
Accretion of discount
5

 
5

 
14

 
14

Ending asset retirement obligations
$
292

 
$
281

 
$
292

 
$
281


The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the accompanying consolidated balance sheets. As of September 30, 2017 and December 31, 2016, the current portion of the Company's asset retirement obligations was $42 million and $39 million, respectively.