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Long-term debt - Interest-bearing status (Details) - ZAR (R) R in Millions | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Interest-bearing status |  |  |
Interest-bearing debt | R 108,017 | R 80,352 |
Non-interest-bearing debt | 1,437 | 1,053 |
Total long-term debt | R 109,454 | R 81,405 | R 79,877

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- Definition Interest Bearing Status [Abstract] + References No definition available. + Details
Name: | ssl_InterestBearingStatusAbstract
Namespace Prefix: | ssl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate amount of borrowings with original maturities greater than one year, including current and noncurrent borrowings. + References No definition available. + Details
Name: | ssl_LongtermBorrowingsCurrentAndNoncurrent
Namespace Prefix: | ssl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The portion of long-term borrowings bearing interest. + References No definition available. + Details
Name: | ssl_LongtermBorrowingsCurrentAndNoncurrentInterestBearing
Namespace Prefix: | ssl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The portion of long-term borrowings not bearing interest. + References No definition available. + Details
Name: | ssl_LongtermBorrowingsCurrentAndNoncurrentNoninterestBearing
Namespace Prefix: | ssl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant