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COVER PAGE - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-11307-01    
Entity Registrant Name Freeport-McMoRan Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 74-2480931    
Entity Address, Address Line One 333 North Central Avenue    
Entity Address, City or Town Phoenix    
Entity Address, State or Province AZ    
Entity Address, Postal Zip Code 85004-2189    
City Area Code (602)    
Local Phone Number 366-8100    
Title of 12(b) Security Common Stock, par value $0.10 per share    
Trading Symbol FCX    
Security Exchange Name NYSE    
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    
Entity Shell Company false    
Entity Public Float     $ 13.1
Entity Common Stock, Shares Outstanding   1,450,972,426  
Documents Incorporated by Reference [Text Block]
Portions of our proxy statement for our 2020 annual meeting of stockholders are incorporated by reference into Part III (Items 10, 11, 12, 13 and 14) of this report.

 		   
Entity Central Index Key 0000831259    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false