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Going concern - Solvency and Liquidity (Details)
R in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
ZAR (R)
$ / bbl
Jun. 30, 2021
R / $
$ / bbl
Jun. 30, 2022
R / $
$ / bbl
Jun. 30, 2023
Jun. 30, 2020
ZAR (R)
Dec. 31, 2019
ZAR (R)
 [1]
Jun. 30, 2019
ZAR (R)
Going concern              
Cash and cash equivalents R 27,608 [1]       R 34,094 [1] R 12,670 R 15,819
Available facilities R 27,000       R 10,500    
Net Debt To EBITDA Ratio 2.6       4.3    
Covenant level of net debt to EBITDA 4.0            
Cash flow forecast period following the reporting date 9 months            
Brent crude oil price per unit | $ / bbl 45            
Working capital percentage 14.90%            
Announced asset divestment proceeds R 3,300            
Forecast              
Going concern              
Brent crude oil price per unit | $ / bbl   45.50 53.58        
Average foreign exchange rate | R / $   14.83 15.10        
Working capital percentage   15.60%   14.00%      
[1] Includes bank overdraft.