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Financial risk management and financial instruments - Derivatives Entered (Details)
R in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2019
ZAR (R)
MT
MMBbls
Jun. 30, 2018
USD ($)
MT
$ / T
$ / gal
$ / bbl
R / $
MMBbls
Jun. 30, 2018
ZAR (R)
MT
MMBbls
Jun. 30, 2019
USD ($)
$ / gal
R / $
MMBbls
Jun. 30, 2019
ZAR (R)
$ / gal
R / $
MMBbls
Jun. 30, 2018
ZAR (R)
MT
$ / T
$ / gal
$ / bbl
R / $
MMBbls
Crude oil options            
Financial risk management and financial instruments            
Premium paid | $   $ 207        
Number of barrels | MMBbls 48 98 98      
Number of barrels - open positions | MMBbls   48       48
Number of barrels - settled | MMBbls 48 50 50      
Average Brent crude oil price floor, net of costs (in USD per barrel) | $ / bbl   53.36       53.36
Realised (losses)/gains recognised in the income statement R (1,857)   R (1,605)      
Unrealised (losses)/gains recognised in the income statement 1,359   (1,698)      
Amount included in the statement of financial position           R 482
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   13.84 13.84 13.14
Annual average cap (in Rand per USD) | R / $   15.14   16.63 16.63 15.14
Realised (losses)/gains recognised in the income statement (610)   2,772      
Unrealised (losses)/gains recognised in the income statement R 933   R (1,836)      
Amount included in the statement of financial position         R 579 R (338)
Coal swaps            
Financial risk management and financial instruments            
Number of tons hedged | MT 1.40 4.20 4.20      
Number of tons - open positions | MT   1.40       1.40
Number of tons - settled | MT 1.40 2.80 2.80      
Average swap price | $ / T   81.82       81.82
Realised (losses)/gains recognised in the income statement R (337)   R (618)      
Unrealised (losses)/gains recognised in the income statement R 428   R (406)      
Amount included in the statement of financial position           R (414)
Ethane swaps            
Financial risk management and financial instruments            
Number of barrels | MMBbls 16.00 5.80 5.80      
Number of barrels - open positions | MMBbls   3.50   12.50 12.50 3.50
Number of barrels - settled | MMBbls 3.50 2.30 2.30      
Average swap price | $ / gal   0.27   0.28 0.28 0.27
Realised (losses)/gains recognised in the income statement R 29   R (1)      
Unrealised (losses)/gains recognised in the income statement R (491)   R 30      
Amount included in the statement of financial position         R (454) R 33