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PROVISIONS - Environmental Rehabilitation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Provisions, noncurrent $ 3,114 $ 2,904
Environmental rehabilitation    
Disclosure of other provisions [line items]    
Environmental rehabilitation, beginning balance 2,837 3,096
PERs acquired (divested) during the year 425 0
Other increase (decrease) during period (87) (247)
Cash payments (21) (18)
Settlement gains (1) (1)
Accretion 57 74
Environmental rehabilitation, ending balance 3,078 2,837
Current provisions (156) (111)
Provisions, noncurrent 2,922 2,726
Discontinued operations | Environmental rehabilitation    
Disclosure of other provisions [line items]    
Other increase (decrease) during period (75) (30)
Cash payments (72) (48)
Settlement gains (3) (2)
Accretion $ 18 $ 13