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Salient features - Reconciliation of headline earnings (Details) R / shares in Units, R in Millions, $ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
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Dec. 31, 2018 ZAR (R) R / shares | Dec. 31, 2017 ZAR (R) R / shares | Jun. 30, 2018 USD ($) | Jun. 30, 2018 CAD ($) | Jun. 30, 2018 ZAR (R) R / shares
Salient features |  |  |  |  |  |
Earnings attributable to owners of Sasol Limited |  | R 14,740 | R 6,901 |  |  | R 8,729
Effect of remeasurement items for subsidiaries and joint operations | [1] | (599) | 4,244 |  |  | 9,901
Reversal of impairment | [2] | (957) | (69) |  |  | (354)
(Profit)/loss on disposal of non-current assets |  | (27) | (36) |  |  | 7
Loss/(profit) on disposal of investment in businesses |  |  | 83 |  |  | (833)
Scrapping of non-current assets |  | 376 | 1,453 |  |  | 1,654
Write-off of unsuccessful exploration wells |  | 7 | 36 |  |  | 312
Realisation of foreign currency translation reserve |  |  | (3) |  |  |
Tax effect and non-controlling interest |  | 168 | (339) |  |  | (1,843)
Effect of remeasurement items for equity accounted investments |  | 15 | (1) |  |  | 11
Headline earnings |  | R 14,324 | R 10,805 |  |  | R 16,798
Headline earnings per share (HEPS) |  |  |  |  |  |
Headline earnings per share | R / shares |  | R 23.25 | R 17.67 |  |  | R 27.44
Diluted headline earnings per share | R / shares |  | R 23.08 | R 17.60 |  |  | R 27.27
Canadian shale gas asset |  |  |  |  |  |
Salient features |  |  |  |  |  |
Impairment loss |  |  |  |  | $ 281 | R 2,800
US Gas-To-Liquids (GTL) |  |  |  |  |  |
Headline earnings per share (HEPS) |  |  |  |  |  |
Scrapping of assets |  |  |  | $ 83 |  | 1,100
Mining |  |  |  |  |  |
Salient features |  |  |  |  |  |
Effect of remeasurement items for subsidiaries and joint operations |  | R 7 | R (7) |  |  | 34
Exploration And Production International |  |  |  |  |  |
Salient features |  |  |  |  |  |
Effect of remeasurement items for subsidiaries and joint operations |  | 7 | 2,835 |  |  | 4,241
Energy |  |  |  |  |  |
Salient features |  |  |  |  |  |
Effect of remeasurement items for subsidiaries and joint operations |  | 122 | 1,249 |  |  | 971
Base Chemicals |  |  |  |  |  |
Salient features |  |  |  |  |  |
Effect of remeasurement items for subsidiaries and joint operations |  | (820) | 148 |  |  | 4,499
Performance Chemicals |  |  |  |  |  |
Salient features |  |  |  |  |  |
Effect of remeasurement items for subsidiaries and joint operations |  | 85 | 1 |  |  | 116
Group Functions |  |  |  |  |  |
Salient features |  |  |  |  |  |
Effect of remeasurement items for subsidiaries and joint operations |  |  | 18 |  |  | 40
Property, plant and equipment |  |  |  |  |  |
Salient features |  |  |  |  |  |
Impairment loss |  | R 2 | 2,715 |  |  | 7,623
Assets under construction |  |  |  |  |  |
Salient features |  |  |  |  |  |
Impairment loss |  |  | 50 |  |  | R 1,492
Other assets |  |  |  |  |  |
Salient features |  |  |  |  |  |
Impairment loss |  |  | R 15 |  |  |
[1] | Included in the prior period is the scrapping of our US gas-to-liquids (GTL) project amounting to R1.1 billion (US$83 million) and a partial impairment of our Canadian shale gas assets of R2.8 billion (CAD281 million).
[2] | Includes the impact of the partial reversal of the previous impairment of the Chlor Vinyls cash generating unit as a result of the Sasolburg useful life structural change in the integrated ethylene value chain. The performance of this CGU is highly sensitive to the rand/US dollar exchange rate and US$ product prices. Macroeconomic factors are outside of the control of management and as such we continue to monitor these assets.

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