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Basis of preparation - Standards applied (Details) - ZAR (R)
R in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Disclosure of initial application of standards or interpretations      
Property, plant and equipment and assets under construction R 365,559    
Finance costs [1] (252) R (1,689) R (3,759)
Pro forma results before amendment      
Disclosure of initial application of standards or interpretations      
Property, plant and equipment and assets under construction 364,610    
Finance costs (1,201)    
Adjustment on adoption of IAS 23 amendment      
Disclosure of initial application of standards or interpretations      
Property, plant and equipment and assets under construction 949    
Finance costs R 949    
[1] Finance costs decreased mainly due to the adoption of the amendment to IAS 23 'Borrowing Costs' on 1 July 2018, which resulted in a higher capitalisation of costs.