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Financial risk management and financial instruments - Derivatives Entered (Details)
R in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2018
USD ($)
MT
$ / T
$ / gal
$ / bbl
R / $
MMBbls
Jun. 30, 2018
ZAR (R)
MT
MMBbls
Jun. 30, 2017
USD ($)
MT
$ / T
$ / bbl
R / $
MMBbls
Jun. 30, 2017
ZAR (R)
MT
MMBbls
Jun. 30, 2018
ZAR (R)
MT
$ / T
$ / gal
$ / bbl
R / $
MMBbls
Jun. 30, 2017
ZAR (R)
MT
$ / T
$ / bbl
R / $
MMBbls
Crude oil options            
Financial risk management and financial instruments            
Premium paid | $ $ 207   $ 103      
Number of barrels | MMBbls 98 98 55 55    
Number of barrels - open positions | MMBbls 48   25   48 25
Number of barrels - settled | MMBbls 50 50 30 30    
Average Brent crude oil price floor, net of costs (in USD per barrel) | $ / bbl 53.36   48.15   53.36 48.15
Realised (losses)/gains recognised in the income statement   R (1,605)   R (732)    
Unrealised (losses)/gains recognised in the income statement   (1,698)   495    
Amount included in the statement of financial position         R 482 R 1,116
Zero cost collar            
Financial risk management and financial instruments            
Contract/Notional amount | $ $ 4,000   $ 4,000      
Annual average floor (in Rand per USD) | R / $ 13.14   13.46   13.14 13.46
Annual average cap (in Rand per USD) | R / $ 15.14   15.51   15.14 15.51
Realised (losses)/gains recognised in the income statement   2,772        
Unrealised (losses)/gains recognised in the income statement   R (1,836)   R 1,608    
Amount included in the statement of financial position         R (338) R 1,543
Coal swaps            
Financial risk management and financial instruments            
Number of tons hedged | MT 4.20 4.20 3.93 3.93    
Number of tons - open positions | MT 1.40   2.10   1.40 2.10
Number of tons - settled | MT 2.80 2.80 1.83 1.83    
Average swap price | $ / T 81.82   77.52   81.82 77.52
Realised (losses)/gains recognised in the income statement   R (618)   R 74    
Unrealised (losses)/gains recognised in the income statement   R (406)   R 20    
Amount included in the statement of financial position         R (414) R 19
Ethane swaps            
Financial risk management and financial instruments            
Number of barrels | MMBbls 5.80 5.80        
Number of barrels - open positions | MMBbls 3.50       3.50  
Number of barrels - settled | MMBbls 2.30 2.30        
Average Brent crude oil price floor, net of costs (in USD per barrel) | $ / gal 0.27       0.27  
Realised (losses)/gains recognised in the income statement   R (1)        
Unrealised (losses)/gains recognised in the income statement   R 30        
Amount included in the statement of financial position         R 33