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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2013
Disclosure Text Block [Abstract]  
Asset Retirement Obligations
7. Asset Retirement Obligations

The majority of Anadarko’s AROs relate to the plugging of wells and the related abandonment of oil and gas properties. Revisions in estimated liabilities during the period relate primarily to changes in estimates of asset retirement costs and include, but are not limited to, revisions of estimated inflation rates, changes in property lives, and the expected timing of settlement. The following summarizes changes in the Company’s AROs during 2013 and 2012:
millions
2013
 
2012
Carrying amount of asset retirement obligations at January 1
$
1,885

 
$
1,768

Liabilities incurred
182

 
70

Property dispositions
(76
)
 
(78
)
Liabilities settled
(162
)
 
(89
)
Accretion expense
110

 
110

Revisions in estimated liabilities
83

 
104

Carrying amount of asset retirement obligations at December 31
$
2,022

 
$
1,885