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Long-term debt - Business segmentation (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Long-term debt      
Total long-term debt R 109,454 R 81,405 R 79,877
Mining      
Long-term debt      
Total long-term debt 679 1,360  
Exploration And Production International      
Long-term debt      
Total long-term debt 784 755  
Energy      
Long-term debt      
Total long-term debt 9,503 7,058  
Base Chemicals      
Long-term debt      
Total long-term debt 33,511 21,890  
Performance Chemicals      
Long-term debt      
Total long-term debt 28,119 18,037  
Group Functions      
Long-term debt      
Total long-term debt R 36,858 R 32,305