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Long-term debt and finance leases - Summary (Details) - ZAR (R)
R in Millions
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Long-term debt and finance leases      
Total long-term debt R 137,339 R 109,454 R 81,405
Short-term portion of long-term debt (2,544) (12,763)  
Long-term debt, non-current portion 134,795 96,691  
Long-term debt 127,350 89,411  
Finance leases R 7,445 R 7,280