2.2.0.7 false Summary of Significant Accounting Policies 0201 - Disclosure - Summary of Significant Accounting Policies true false false false 1 USD false false Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Summary of Significant Accounting Policies [Abstract] 0 us-gaap_GeneralPoliciesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES 1 us-gaap_SignificantAccountingPoliciesTextBlock us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0   <div align="left" style="font-family: 'Times New Roman',Times,serif">   <div align="center" style="font-size: 10pt; margin-top: 0pt"><b> </b> </div> <div align="left" style="font-size: 10pt; margin-top: 0pt"> </div> <div align="left" style="font-size: 10pt; margin-top: 12pt"><b>1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</b> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     As of September 30, 2010, Apache’s significant accounting policies are consistent with those discussed in Note 1 of its consolidated financial statements contained in the Annual Report on Form 10-K for the fiscal year ended December 31, 2009. </div> <div align="left" style="font-size: 10pt; margin-top: 6pt"><u><b>Use of Estimates</b></u> </div> <div align="left" style="font-size: 10pt; margin-top: 6pt">     The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates with regard to these financial statements include the estimate of proved oil and gas reserves and related present value estimates of future net cash flow therefrom, asset retirement obligations and income taxes. Actual results could differ from those estimates. </div> </div>  <!-- Begin Block Tagged Note false false false us-types:textBlockItemType textblock This element may be used to describe all significant accounting policies of the reporting entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 22 -Paragraph 8 false 1 2 false UnKnown UnKnown UnKnown false true