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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2014
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, 2014 and 2013: 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in millions)
Beginning asset retirement obligations
 
$
193

 
$
191

 
$
194

 
$
198

New wells placed on production
 
1

 
1

 
3

 
3

Changes in estimates
 
2

 
—

 
3

 
(6
)
Dispositions
 
(5
)
 
—

 
(7
)
 
(4
)
Liabilities settled
 
(6
)
 
(4
)
 
(14
)
 
(10
)
Accretion of discount
 
3

 
3

 
9

 
9

Accretion of discount on discontinued operations
 
—

 
—

 
—

 
1

Ending asset retirement obligations
 
$
188

 
$
191

 
$
188

 
$
191


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, 2014, the current portion of the Company's asset retirement obligations was $27 million, as compared to $19 million at December 31, 2013.