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Acquisitions and Business Combinations - Disclosure of Goodwill Acquired (Details)
R in Millions, $ in Millions
Jun. 30, 2019
ZAR (R)
Jun. 30, 2018
ZAR (R)
Jun. 30, 2018
USD ($)
Disclosure of detailed information about business combination [line items]      
Goodwill R 520 R 526  
Moab Khotsong      
Disclosure of detailed information about business combination [line items]      
Consideration paid 0 3,474 $ 300
Fair value of net identifiable assets acquired 0 (3,172)  
Goodwill R 0 R 302