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Remeasurement items affecting operating profit - Cash Generating Units (Details)
R in Millions, $ in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ZAR (R)
Jun. 30, 2017
ZAR (R)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
ZAR (R)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
ZAR (R)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
ZAR (R)
Jun. 30, 2016
CAD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
ZAR (R)
Jun. 30, 2015
CAD ($)
Jun. 30, 2015
ZAR (R)
Jun. 30, 2014
CAD ($)
Jun. 30, 2014
ZAR (R)
Jun. 30, 2018
CAD ($)
R / $
Jun. 30, 2018
USD ($)
R / $
Jun. 30, 2018
ZAR (R)
R / $
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             R 8,761                        
Impairment loss             9,115   R 2,477     R 12,320              
Property, plant and equipment.     R 158,773           158,773     155,054             R 167,457
Reversal of impairment loss             354   R 1,136                    
Chlor Vinyls value chain                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             5,165                        
Impairment loss             5,200                        
Change in exchange rate | R / $                                 0.50 0.50 0.50
Change in recoverable amount of CGU due to change in exchange rate                                     R 986
Canadian shale gas asset                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             2,764                        
Impairment loss       $ 281 R 2,800         $ 880   9,900 $ 133 R 1,300 $ 540 R 5,300      
Assets                                 $ 232   R 2,400
Discount rate - risk adjusted                                 10.00% 10.00% 10.00%
Property, plant and equipment. | $                                 $ 315    
Short-term rehabilitation provision | $                                 (8)    
Final carry payable | $                                 $ (75)    
Percentage change in assumptions                                 5.00% 5.00% 5.00%
Canadian shale gas asset | Minimum                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Change in recoverable amounts from change in volume forecasts, gas price or exchange rates                                 $ 76   R 792
Canadian shale gas asset | Maximum                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Change in recoverable amounts from change in volume forecasts, gas price or exchange rates                                 $ 90   R 936
Sasol Petroleum Mozambique - PSA                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             1,143                        
Impairment loss           $ 94.0 1,100                        
Discount rate - risk adjusted     12.16%           12.16%               13.23% 13.23% 13.23%
Increase in oil volume (as a percent)                                 20.00% 20.00% 20.00%
Increase in recoverable amount due to increase in oil volume | $                                   $ 35.0  
Change in gas prices (as a percent)                                 10.00% 10.00% 10.00%
Change in discount rate (as a percentage)                                 0.50% 0.50% 0.50%
Sasol Petroleum Mozambique - PSA | Minimum                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Change in recoverable amount due to change in gas prices | $                                   $ 24.0  
Change in recoverable amount due to change in discount rate | $                                   19.0  
Sasol Petroleum Mozambique - PSA | Maximum                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Change in recoverable amount due to change in gas prices | $                                   28.0  
Change in recoverable amount due to change in discount rate | $                                   $ 21.0  
Other cash-generating units                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             (311)                        
US Gas-To-Liquids (GTL)                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss               $ 130.0 R 1,700                    
Remaining capitalised FEED costs scrapped $ 83.0 R 1,100                                  
Lake Charles Chemicals Project                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss                     $ 65.0 956              
Project cost overrun that would impact recoverable amount | $                     2,000.0                
Previous estimated useful life (in years)     25 years                                
Estimated useful life (in years)     50 years                                
Reversal of impairment loss               65.0 R 849                    
Project completion (in percentage)     74.00%           74.00%                    
US phenolics                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss               $ 38.4 R 527   $ 11.2 165              
Property, plant and equipment                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             7,623                        
Impairment loss             7,623   415     8,424              
Reversal of impairment loss                 272                    
Property, plant and equipment | Chlor Vinyls value chain                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             4,866                        
Property, plant and equipment | Canadian shale gas asset                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             2,714                        
Property, plant and equipment | Other cash-generating units                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             43                        
Assets under construction                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             1,478                        
Impairment loss             1,492   1,942     3,586              
Reversal of impairment loss             14   849                    
Assets under construction | Chlor Vinyls value chain                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             299                        
Assets under construction | Canadian shale gas asset                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             50                        
Assets under construction | Sasol Petroleum Mozambique - PSA                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             1,143                        
Assets under construction | Other cash-generating units                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             (14)                        
Intangible assets and goodwill                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             (56)                        
Impairment loss                 R 120     R 310              
Reversal of impairment loss             56                        
Intangible assets and goodwill | Other cash-generating units                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             (56)                        
Other assets                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             (284)                        
Reversal of impairment loss             15                        
Other assets | Other cash-generating units                                      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]                                      
Impairment loss (reversal of impairment loss)             R (284)