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PROVISIONS - Environmental Rehabilitation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]    
Provisions, noncurrent $ 3,139 $ 3,114
Environmental rehabilitation    
Disclosure of other provisions [line items]    
Environmental rehabilitation, beginning balance 3,078 2,837
PERs acquired (divested) during the year (6) 425
Other increase (decrease) during period 1 (87)
Cash payments (39) (21)
Settlement gains (3) (1)
Accretion 25 57
Environmental rehabilitation, ending balance 3,081 3,078
Current provisions (131) (156)
Provisions, noncurrent 2,950 2,922
Discontinued operations | Environmental rehabilitation    
Disclosure of other provisions [line items]    
Other increase (decrease) during period 79 (75)
Cash payments (67) (72)
Settlement gains (3) (3)
Accretion $ 16 $ 18