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Cover - USD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 29, 2021
Jun. 30, 2020
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-4300    
Entity Registrant Name APACHE CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 41-0747868    
Entity Address, Address Line One One Post Oak Central, 2000 Post Oak Boulevard, Suite 100    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77056-4400    
City Area Code 713    
Local Phone Number 296-6000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 5,095,687,766
Entity Common Stock, Shares Outstanding   377,860,971  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement relating to the registrant’s 2021 annual meeting of stockholders are incorporated by reference in Part II and Part III of this Annual Report on Form 10-K.
On January 4, 2021, the registrant (Apache) announced that its Board of Directors authorized Apache to proceed with the implementation of a holding company reorganization, in connection with which, Apache will create APA Corporation, a new holding company (APA). Upon completion of the holding company reorganization, Apache will be a wholly-owned subsidiary of APA, APA will be
the successor issuer to Apache pursuant to Rule 12g-3(a) under the Securities Exchange Act of 1934, as amended, and APA will replace Apache as the public company trading on the Nasdaq Global Select Market under the ticker symbol “APA”. If the holding company reorganization is completed prior to the date that Apache’s definitive proxy statement relating to the 2021 annual meeting of stockholders is filed with the Securities and Exchange Commission, then the definitive proxy statement will be filed by APA, as successor issuer to Apache. 		   
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000006769    
Nasdaq Global Select Market      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $0.625 par value    
Trading Symbol APA    
Security Exchange Name NASDAQ