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Trade and other receivables - Age analysis of trade receivables (Details)
R in Millions
Jun. 30, 2018
ZAR (R)
customer
Jun. 30, 2017
ZAR (R)
customer
Jun. 30, 2016
customer
Disclosure of credit risk exposure [line items]      
Trade receivables R 23,742 R 20,982  
Number of customers representing more than ten percent of trade receivables | customer 0 0 0
Collateral R 0    
Not past due date      
Disclosure of credit risk exposure [line items]      
Trade receivables 21,611 R 19,537  
Past due 0-30 days      
Disclosure of credit risk exposure [line items]      
Trade receivables 1,477 1,073  
Past due 31-150 days      
Disclosure of credit risk exposure [line items]      
Trade receivables 257 197  
Past due 151 days - one year      
Disclosure of credit risk exposure [line items]      
Trade receivables 93 22  
More than one year      
Disclosure of credit risk exposure [line items]      
Trade receivables 304 153  
Impairment      
Disclosure of credit risk exposure [line items]      
Trade receivables (199) (158)  
Impairment | Not past due date      
Disclosure of credit risk exposure [line items]      
Trade receivables (3) (5)  
Impairment | Past due 0-30 days      
Disclosure of credit risk exposure [line items]      
Trade receivables (5) (7)  
Impairment | Past due 31-150 days      
Disclosure of credit risk exposure [line items]      
Trade receivables (18) (6)  
Impairment | Past due 151 days - one year      
Disclosure of credit risk exposure [line items]      
Trade receivables (44) (10)  
Impairment | More than one year      
Disclosure of credit risk exposure [line items]      
Trade receivables R (129) R (130)