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Long-term debt and finance leases - Interest-bearing status (Details) - ZAR (R) R in Millions	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Interest-bearing status
Interest-bearing debt	R 136,394	R 108,017
Non-interest-bearing debt	945	1,437
Total long-term debt	R 137,339	R 109,454	R 81,405

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- Definition

Interest Bearing Status [Abstract]

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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.

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No definition available.

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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.

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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.

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No definition available.

+ Details

Name:	ssl_LongtermBorrowingsCurrentAndNoncurrentNoninterestBearing
Namespace Prefix:	ssl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant