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Financial risk management and financial instruments - Significant Derivatives Sensitivity Analysis (Details)
R in Millions
 12 Months Ended
Jun. 30, 2022
ZAR (R)
$ / bbl
$ / gal
R / $
Jun. 30, 2021
ZAR (R)
$ / bbl
R / $
$ / gal
Ethane price    
Financial risk management and financial instruments    
Increase in price or rate assumption | $ / gal 2 2
Decrease in price or rate assumption | $ / gal (2) (2)
Crude oil price    
Financial risk management and financial instruments    
Increase in price or rate assumption | $ / bbl 2 2
Decrease in price or rate assumption | $ / bbl (2) (2)
USD/ZAR spot price    
Financial risk management and financial instruments    
Increase in price or rate assumption | R / $ 1 1
Decrease in price or rate assumption | R / $ (1) (1)
USD Libor curve    
Financial risk management and financial instruments    
Decrease in significant input variable (as a percent) (0.50%) (0.50%)
USD Swap curve    
Financial risk management and financial instruments    
Increase in significant input variable (as a percent) 0.10% 0.10%
Decrease in significant input variable (as a percent) (0.10%) (0.10%)
Rand Swap curve    
Financial risk management and financial instruments    
Increase in significant input variable (as a percent) 1.00% 1.00%
Decrease in significant input variable (as a percent) (1.00%) (1.00%)
Crude oil put options | Crude oil price    
Financial risk management and financial instruments    
Impact on fair value from increase in significant input variable   R (385)
Impact on fair value from decrease in significant input variable   385
Ethane swap options | Ethane price    
Financial risk management and financial instruments    
Impact on fair value from increase in significant input variable   14
Impact on fair value from decrease in significant input variable   (14)
Foreign exchange zero cost collars | USD/ZAR spot price    
Financial risk management and financial instruments    
Impact on fair value from increase in significant input variable R (1,511) (1,702)
Impact on fair value from decrease in significant input variable 1,511 1,702
Gain (loss) for derivatives settled at spot price between cap and floor R 0  
Minimum weakening of exchange rate for fair value impact | R / $ 1.78  
Derivative cap | R / $ 18.06  
Crude oil zero cost collar | Crude oil price    
Financial risk management and financial instruments    
Impact on fair value from increase in significant input variable R (672) (382)
Impact on fair value from decrease in significant input variable 672 382
Interest rate swap | USD Libor curve    
Financial risk management and financial instruments    
Impact on fair value from decrease in significant input variable   559
Synfuels oxygen supply contract embedded derivative | USD/ZAR spot price    
Financial risk management and financial instruments    
Impact on fair value from increase in significant input variable (513) (601)
Impact on fair value from decrease in significant input variable 513 601
Synfuels oxygen supply contract embedded derivative | USD Swap curve    
Financial risk management and financial instruments    
Impact on fair value from increase in significant input variable 86 98
Impact on fair value from decrease in significant input variable (87) (99)
Synfuels oxygen supply contract embedded derivative | Rand Swap curve    
Financial risk management and financial instruments    
Impact on fair value from increase in significant input variable (786) (825)
Impact on fair value from decrease in significant input variable R 911 R 955