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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2015
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 facilities. The following table summarizes the Company's asset retirement obligation activity during the three and nine months ended September 30, 2015 and 2014: 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2015
 
2014
 
2015
 
2014
 
 
(in millions)
Beginning asset retirement obligations
 
$
187

 
$
193

 
$
189

 
$
194

New wells placed on production
 
1

 
1

 
2

 
3

Changes in estimates
 
—

 
2

 
—

 
3

Dispositions
 
—

 
(5
)
 
—

 
(7
)
Liabilities settled
 
(9
)
 
(6
)
 
(18
)
 
(14
)
Accretion of discount
 
3

 
3

 
9

 
9

Ending asset retirement obligations
 
$
182

 
$
188

 
$
182

 
$
188


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, 2015, the current portion of the Company's asset retirement obligations was $31 million, as compared to $28 million at December 31, 2014.