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Long-term debt - Maturity profile (Details) - ZAR (R)
R in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Maturity profile      
Total long-term debt R 109,454 R 81,405 R 79,877
Within one year      
Maturity profile      
Total long-term debt 12,763 7,093  
One to five years      
Maturity profile      
Total long-term debt 72,899 58,933  
More than five years      
Maturity profile      
Total long-term debt R 23,792 R 15,379