XML 219 R180.htm IDEA: XBRL DOCUMENT v3.19.3
Commitments and Contingencies - Narrative (Details)
R in Millions, $ in Millions
 12 Months Ended
Dec. 01, 2008
ZAR (R)
shares
Jun. 30, 2019
ZAR (R)
Jun. 30, 2018
ZAR (R)
Dec. 01, 2008
USD ($)
Disclosure of contingent liabilities [line items]        
Contractual obligations in respect of mineral tenement leases   R 83 R 59  
Additional cash payable when decision to mine is made | $       $ 6
Period of inactivity by the plaintiffs   5 years    
Wafi-Golpu joint operation        
Disclosure of contingent liabilities [line items]        
Contractual obligations in respect of mineral tenement leases   R 81 R 58  
Additional cash payable when decision to mine is made | $       4
Rio Tinto        
Disclosure of contingent liabilities [line items]        
Shares issued for purchase of rights to the royalty agreement (in shares) | shares 3,364,675      
Value of shares on transaction date R 242      
Additional cash payable when decision to mine is made | $       $ 10
Liability for environmental disturbances and degradation caused before the effective date (in excess of)        
Disclosure of contingent liabilities [line items]        
Financial exposure   75    
Liability for environmental disturbances and degradation caused before the effective date (in excess of) | Rand Uranium        
Disclosure of contingent liabilities [line items]        
Financial exposure   R 75