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Long-term debt and finance leases - Business segmentation (Details) - ZAR (R)
R in Millions
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Long-term debt      
Total long-term debt R 137,339 R 109,454 R 81,405
Mining      
Long-term debt      
Total long-term debt   679  
Exploration And Production International      
Long-term debt      
Total long-term debt   784  
Energy      
Long-term debt      
Total long-term debt 8,893 9,503  
Base Chemicals      
Long-term debt      
Total long-term debt 5,503 33,716  
Performance Chemicals      
Long-term debt      
Total long-term debt 1,466 27,914  
Group Functions      
Long-term debt      
Total long-term debt R 121,477 R 36,858