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Share capital - Issued Share Capital (Details) - ZAR (R)
R / shares in Units, R in Millions
12 Months Ended
Jun. 26, 2018
Jun. 04, 2018
Feb. 26, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Disclosure of classes of share capital [line items]              
Equity       R 228,608 R 217,234 R 212,418 R 196,483
Repurchase and cancellation of shares       43,503,454      
Share capital              
Disclosure of classes of share capital [line items]              
Equity       R 15,775 29,282 29,282 29,228
Share repurchase programme              
Disclosure of classes of share capital [line items]              
Equity         R (2,641) R (2,641) R (2,641)
Sasol Inzalo share transaction              
Disclosure of classes of share capital [line items]              
Repurchase and cancellation of shares 9,461,882 25,231,686          
Share repurchase price R 475.03 R 0.01          
Sasol Investment Company Pty Ltd              
Disclosure of classes of share capital [line items]              
Repurchase and cancellation of shares     8,809,886        
Treasury shares (in shares)       0 8,809,886 8,809,886  
Treasury shares, percentage of issued shares held by subsidiary (as a percent)         1.43% 1.43%