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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 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 months ended March 31, 2014 and 2013: 
 
 
Three Months Ended
March 31,
 
 
2014
 
2013
 
(in millions)
Beginning asset retirement obligations
 
$
194

 
$
198

New wells placed on production
 
1

 
3

Changes in estimates
 
1

 
(6
)
Dispositions
 
(1
)
 
(4
)
Liabilities settled
 
(4
)
 
(3
)
Accretion of discount
 
3

 
3

Ending asset retirement obligations
 
$
194

 
$
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 March 31, 2014 and December 31, 2013, the current portions of the Company's asset retirement obligations were both $19 million.