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Financial risk management and financial instruments - Statement of Financial Position Impact (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Derivatives and financial guarantees    
Financial risk management and financial instruments    
Financial liabilities R (2,059) R (1,473)
Derivatives    
Financial risk management and financial instruments    
Financial assets 1,827 2,739
Financial liabilities (1,912) (1,468)
Foreign exchange contracts    
Financial risk management and financial instruments    
Financial assets 42 4
Financial liabilities (45) (393)
Coal swaps    
Financial risk management and financial instruments    
Financial assets   21
Financial liabilities (414) (2)
Crude oil futures    
Financial risk management and financial instruments    
Financial assets   52
Financial liabilities (91)  
Zero cost collar    
Financial risk management and financial instruments    
Financial assets 979 1,546
Financial liabilities (1,317) (3)
Crude oil options    
Financial risk management and financial instruments    
Financial assets 482 1,116
Interest rate swap    
Financial risk management and financial instruments    
Financial assets 291  
Financial liabilities (45) (1,070)
Ethane swaps    
Financial risk management and financial instruments    
Financial assets 33  
Financial guarantees    
Financial risk management and financial instruments    
Financial liabilities R (147) R (5)