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Financial risk management and financial instruments - Interest Rate Risk (Details)
R in Millions, $ in Millions
1 Months Ended
Jul. 31, 2015
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
ZAR (R)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
ZAR (R)
Variable          
Financial risk management and financial instruments          
Financial assets     R 18,657   R 29,044
Financial liabilities     (58,908)   (38,454)
Net financial instruments     R (40,251)   R (9,410)
Variable rate as a percentage of total financial assets   99.00% 99.00% 99.00% 99.00%
Variable rate as a percentage of total financial liabilities   54.00% 54.00% 46.00% 46.00%
Fixed          
Financial risk management and financial instruments          
Financial assets     R 97   R 250
Financial liabilities     (51,144)   (44,395)
Net financial instruments     R (51,047)   R (44,145)
Fixed rate as a percentage of total financial assets   1.00% 1.00% 1.00% 1.00%
Fixed rate as a percentage of total financial liabilities   46.00% 46.00% 54.00% 54.00%
Interest rate swap          
Financial risk management and financial instruments          
Financial assets     R 291    
Financial liabilities     R (45)   R (1,070)
Interest rate swap | Cash flow hedge          
Financial risk management and financial instruments          
Percentage of LIBOR exposure hedged 50.00%        
Contract/Notional amount | $ $ 3,995 $ 2,000   $ 1,980