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Long-term debt - Interest-bearing status (Details) - ZAR (R) R in Millions	Jun. 30, 2025	Jun. 30, 2024
Interest-bearing status
Interest-bearing debt	R 102,645	R 117,031

X

- 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

X

- 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