XML 42 R18.htm IDEA: XBRL DOCUMENT v3.6.0.2
Asset Retirement Obligations (Notes)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Disclosure [Text Block]
Asset Retirement Obligations

The change in our ARO for continuing operations for each of the three years ended December 31, is set forth below:
 
 
2016
 
2015
 
2014
 
 
(In millions)
Balance at January 1
 
$
194

 
$
186

 
$
122

Accretion expense
 
10

 
10

 
8

Additions(1)
 
15

 
6

 
58

Revisions
 
(23
)
 
(2
)
 
16

Settlements(2)
 
(40
)
 
(6
)
 
(18
)
Balance at December 31
 
156

 
194

 
186

Less: Current portion of ARO at December 31
 
(2
)
 
(2
)
 
(3
)
Total long-term ARO at December 31
 
$
154

 
$
192

 
$
183

_________________
(1)
For the year ended December 31, 2016, additions include $8 million of abandonment obligations assumed through our Anadarko Basin acquisition. See Note 6, "Oil and Gas Properties." For the year ended December 31, 2014, additions include $28 million for our Pearl development in offshore China and $30 million for abandonment obligations in our domestic business.
(2)
For the year ended December 31, 2016, settlements include $35 million related to the sale of our Texas assets. For the year ended December 31, 2014, settlements include $10 million related to the sale of our Granite Wash assets. See Note 6, "Oil and Gas Properties."