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Intangible Assets - Schedule of Changes in Technology Based Assets (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year R 19  
Balance at end of year 13 R 19
Technology-based assets    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 19  
Balance at end of year 13 19
Technology-based assets | Cost    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 48 33
Fully depreciated assets no longer in use derecognised 10 0
Transfers and other movements 0 6
Additions 1 9
Balance at end of year 39 48
Technology-based assets | Accumulated amortisation and impairments    
Reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (29) (21)
Fully depreciated assets no longer in use derecognised (10) 0
Amortisation charge 7 8
Balance at end of year R (26) R (29)