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Assets under construction - Business segmentation and cash flow (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Assets Under Construction [Line Items]      
Total operations R 165,361 R 130,734  
Current year additions 52,806 60,312 R 70,849
Adjustments for non-cash items (171) (420) (1,427)
cash flow hedge accounting 1 (2) (2)
movement in environmental provisions capitalised (172) (418) (1,425)
Per the statement of cash flows 52,635 59,892 R 69,422
Mining      
Assets Under Construction [Line Items]      
Total operations 2,095 1,141  
Exploration And Production International      
Assets Under Construction [Line Items]      
Total operations 6,457 6,256  
Energy      
Assets Under Construction [Line Items]      
Total operations 5,993 9,064  
Base Chemicals      
Assets Under Construction [Line Items]      
Total operations 75,099 59,908  
Performance Chemicals      
Assets Under Construction [Line Items]      
Total operations 75,144 54,006  
Group Functions      
Assets Under Construction [Line Items]      
Total operations R 573 R 359