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PROVISIONS - Provisions by Type (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]    
Provisions $ 3,139 $ 3,114
Environmental rehabilitation (“PER”)    
Disclosure of other provisions [line items]    
Provisions 2,950 2,922
Post-retirement benefits    
Disclosure of other provisions [line items]    
Provisions 43 43
Share-based payment arrangements [member]    
Disclosure of other provisions [line items]    
Provisions 24 26
Other employee benefits    
Disclosure of other provisions [line items]    
Provisions 25 19
Other    
Disclosure of other provisions [line items]    
Provisions $ 97 $ 104