Asset Retirement Obligations

12 Months Ended

Dec. 31, 2012

Disclosure Text Block [Abstract]

Asset Retirement Obligations

8.  Asset Retirement Obligations

The majority of Anadarko's AROs relate to the plugging of wells and the related abandonment of oil and gas properties. The following provides a rollforward of the Company's combined short- and long-term AROs. 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.

millions	2012		2011
Carrying amount of asset retirement obligations at January 1	$	1,768	$	1,571
Liabilities incurred		70		39
Property dispositions		(78)		(4)
Liabilities settled		(89)		(68)
Accretion expense		110		100
Revisions in estimated liabilities		104		130
Carrying amount of asset retirement obligations at December 31 (1)	$	1,885	$	1,768

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(1) Short-term AROs of $298million atDecember 31, 2012,and $31million at December 31, 2011, wereincluded in accrued expenses on the Company's Consolidated Balance Sheets.