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Long-term provisions - Expected timing of future cash flows and Business segmentation (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of other provisions [line items]      
Total provisions R 17,727 R 18,779 R 21,873
Short-term portion (2,567) (2,131)  
Long-term provisions 15,160 16,648  
Estimated undiscounted obligation 102,952 102,729  
Mining      
Disclosure of other provisions [line items]      
Long-term provisions 1,324 1,573  
Exploration And Production International      
Disclosure of other provisions [line items]      
Long-term provisions 5,677 5,857  
Energy      
Disclosure of other provisions [line items]      
Long-term provisions 2,909 3,091  
Base Chemicals      
Disclosure of other provisions [line items]      
Long-term provisions 3,057 3,104  
Performance Chemicals      
Disclosure of other provisions [line items]      
Long-term provisions 2,173 2,224  
Group Functions      
Disclosure of other provisions [line items]      
Long-term provisions 20 799  
Within one year      
Disclosure of other provisions [line items]      
Total provisions 2,567 2,131  
One to five years      
Disclosure of other provisions [line items]      
Total provisions 3,715 4,196  
More than five years      
Disclosure of other provisions [line items]      
Total provisions R 11,445 R 12,452