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Asset Retirement Obligations
 6 Months Ended
Jun. 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 six months ended June 30, 2017 and 2016: 
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(in millions)
Beginning asset retirement obligations
 
$
297

 
$
285

 
$
297

 
$
285

New wells placed on production
 
1

 
—

 
1

 
—

Changes in estimates
 
7

 
—

 
7

 
—

Dispositions
 
(7
)
 
—

 
(7
)
 
—

Liabilities settled
 
(9
)
 
(9
)
 
(14
)
 
(13
)
Accretion of discount
 
5

 
5

 
10

 
9

Ending asset retirement obligations
 
$
294

 
$
281

 
$
294

 
$
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 June 30, 2017 and December 31, 2016, the current portion of the Company's asset retirement obligations was $46 million and $39 million, respectively.