Name:	ifrs-full_DisclosureOfDefinedBenefitPlansLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The minimum age of participants in the Money Market Portfolio.

No definition available.

Name:	ssl_AgeOfParticipantInMoneyMarketPortfolio
Namespace Prefix:	ssl_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

The number of investment portfolios members can choose from.

No definition available.

Name:	ssl_NumberOfInvestmentPortfoliosAvailableToMembers
Namespace Prefix:	ssl_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of defined benefit plan assets held in the Aggressive Balanced Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

No definition available.

Name:	ssl_PlanAssetsAtFairValueAggressiveBalancedPortfolioPercentage
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of defined benefit plan assets held in the Cash Flow Matched Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

No definition available.

Name:	ssl_PlanAssetsAtFairValueCashFlowMatchedPortfolioPercentage
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of defined benefit plan assets held in the Low Risk Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

No definition available.

Name:	ssl_PlanAssetsAtFairValueLowRiskPortfolioPercentage
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of defined benefit plan assets held in the Moderate Balanced Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

No definition available.

Name:	ssl_PlanAssetsAtFairValueModerateBalancedPortfolioPercentage
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of defined benefit plan assets held in the Money Market Portfolio. Plan assets comprise assets held by a long-term employee benefit fund.

No definition available.

Name:	ssl_PlanAssetsAtFairValueMoneyMarketPortfolioPercentage
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The target allocation percentage for the Fixed Interest category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

No definition available.

Name:	ssl_TargetAllocationFixedInterestAsset
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The target allocation percentage for the Equity - foreign category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

No definition available.

Name:	ssl_TargetAllocationForeignEquityAsset
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The target allocation percentage for the Equity - local category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

No definition available.

Name:	ssl_TargetAllocationLocalEquityAsset
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The target allocation percentage for the Other category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

No definition available.

Name:	ssl_TargetAllocationOtherAsset
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The target allocation percentage for the Property category of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that is incorporated in the plan's investment policies and strategies.

No definition available.

Name:	ssl_TargetAllocationPropertyAsset
Namespace Prefix:	ssl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_GeographicalAreasAxis=ifrs-full_CountryOfDomicileMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_DefinedBenefitPlansAxis=ssl_DefinedBenefitPensionPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: