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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 2018
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 months ended March 31, 2018 and 2017: 
 
Three Months Ended
March 31,
 
2018
 
2017
 
(in millions)
Beginning asset retirement obligations
$
271

 
$
297

New wells placed on production
1

 
1

Changes in estimates
2

 
—

Obligations reclassified to liabilities held for sale
(6
)
 
—

Liabilities settled
(9
)
 
(6
)
Accretion of discount
4

 
5

Ending asset retirement obligations
$
263

 
$
297


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, 2018 and December 31, 2017, the current portion of the Company's asset retirement obligations was $40 million and $41 million, respectively.