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Financial risk management and financial instruments - Interest Rate Swap (Details) - Cash flow hedge - Interest rate swap
R in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2015
USD ($)
Jun. 30, 2018
ZAR (R)
Jun. 30, 2017
ZAR (R)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Financial risk management and financial instruments          
Average fixed rate       2.70%  
Fair value loss recognised in other comprehensive income   R (950) R (1,560)    
Over-effectiveness recognised in profit and loss   R 52 R 14    
Percentage of LIBOR exposure hedged 50.00%        
Notional amount | $ $ 3,995     $ 2,000 $ 1,980