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OWNERSHIP IN SUBSIDIARIES AND JOINT VENTURES - Joint Venture (Details)
lb in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
lb
Dec. 31, 2020
USD ($)
May 31, 2016
Sumitomo Metal Mining Co., Ltd. [Member]      
Summary of investment holdings [Line Items]      
Due from Joint Ventures, Current   $ 15  
Freeport-McMoRan Corporation [Member]      
Summary of investment holdings [Line Items]      
Number of pounds of copper purchased from Sumitomo (in pounds) | lb 82    
Sumitomo Metal Mining, Ltd. and SMM Morenci Inc. [Member]      
Summary of investment holdings [Line Items]      
Dollar value of pounds purchased from Sumitomo $ 349    
Due from Joint Ventures, Current $ 20    
Morenci      
Summary of investment holdings [Line Items]      
Ownership percentage 72.00%    
Ownership percentage 28.00%    
Morenci | Sumitomo Metal Mining Co., Ltd. [Member]      
Summary of investment holdings [Line Items]      
Ownership percentage 15.00%    
Morenci | SMM Morenci Inc.      
Summary of investment holdings [Line Items]      
Ownership percentage     13.00%