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Segment report - Exploration and Production International Segment (Details)
R in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
ZAR (R)
Bcf
Dec. 31, 2019
ZAR (R)
Jun. 30, 2021
Bcf
Jun. 30, 2020
ZAR (R)
Disclosure of operating segments        
EBIT R 21,650 R 9,853   R (111,030)
Exploration and Production International        
Disclosure of operating segments        
Increase (decrease) in EBIT (as a percent) (12.00%)      
EBIT R 897 1,023   R 1,197
Exploration and Production International | Mozambique        
Disclosure of operating segments        
Increase (decrease) in EBIT (as a percent) 4.00%      
EBIT R 1,400      
Gas production volumes | Bcf 58.7      
Exploration and Production International | Mozambique | Forecast | Minimum        
Disclosure of operating segments        
Gas production volumes | Bcf     114  
Exploration and Production International | Mozambique | Forecast | Maximum        
Disclosure of operating segments        
Gas production volumes | Bcf     118  
Exploration and Production International | Gabon        
Disclosure of operating segments        
EBIT R (85)      
Exploration and Production International | Canada        
Disclosure of operating segments        
EBIT R (95) R (142)