Financial risk management and financial instruments - Derivatives Entered (Details) € in Millions, $ in Millions	12 Months Ended
Jun. 30, 2023 USD ($) $ / bbl $ / gal MT R / $ $ / € MMBbls	Jun. 30, 2022 USD ($) $ / bbl $ / T R / $ MT $ / € MMBbls	Jun. 30, 2023 EUR (€) $ / bbl $ / gal MT R / $ $ / € MMBbls	Jun. 30, 2022 EUR (€) R / $ $ / bbl $ / T MT $ / € MMBbls
Crude oil put options purchased
Financial risk management and financial instruments
Number of barrels - open positions	16.3		16.3
Number of barrels - settled		10.0		10.0
Annual average floor price \| $ / bbl	49.4		49.4
Premium paid \| $	$ 42	$ 0
Crude oil put options sold
Financial risk management and financial instruments
Number of barrels - settled		10.0		10.0
Crude oil zero cost collar
Financial risk management and financial instruments
Number of barrels - open positions		29.0		29.0
Number of barrels - settled	29.0	24.0	29.0	24.0
Annual average floor price \| $ / bbl		63.3		63.3
Annual average cap price \| $ / bbl		96.6		96.6
Crude oil swap options
Financial risk management and financial instruments
Number of barrels - settled		18.0		18.0
Crude oil futures
Financial risk management and financial instruments
Contract/Notional amount - open positions \| $	$ 2	$ 1
Contract/Notional amount - settled \| $	$ 21	$ 29
Annual average floor price \| $ / bbl	75.0	109.9	75.0	109.9
Ethane swap options
Financial risk management and financial instruments
Number of barrels - open positions	3.6		3.6
Number of barrels - settled	1.3	4.0	1.3	4.0
Annual average floor price \| $ / gal	0.301		0.301
Coal swap options
Financial risk management and financial instruments
Number of tons - open positions \| MT		0.4		0.4
Number of tons - settled \| MT	0.9	1.0	0.9	1.0
Annual average floor price \| $ / T		293.7		293.7
Forward exchange contracts \| US Dollar
Financial risk management and financial instruments
Contract/Notional amount - open positions \| $	$ 836	$ 334
Annual average floor price \| R / $	18.61	16.24	18.61	16.24
Forward exchange contracts \| Euro
Financial risk management and financial instruments
Contract/Notional amount - open positions \| €			€ 30	€ 70
Annual average floor price \| $ / €	1.10	1.07	1.10	1.07
Foreign exchange zero cost collars
Financial risk management and financial instruments
Contract/Notional amount - open positions \| $	$ 2,760	$ 4,400
Contract/Notional amount - settled \| $	$ 4,400	$ 3,900
Annual average floor price \| R / $	16.72	15.04	16.72	15.04
Annual average cap price \| R / $	20.71	18.06	20.71	18.06

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

Annual average cap

+ References

No definition available.

+ Details

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

- Definition

Annual average floor

+ References

No definition available.

+ Details

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

- Definition

The amount of premium paid on entering into a derivative contract.

+ References

No definition available.

+ Details

Name:	ssl_DerivativeInstrumentPremiumPaid
Namespace Prefix:	ssl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of derivative monetary notional amount volume open positions.

+ References

No definition available.

+ Details

Name:	ssl_DerivativeMonetaryNotionalAmountVolumeOpenPositions
Namespace Prefix:	ssl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of derivative monetary notional amount volume settled contracts.

+ References

No definition available.

+ Details

Name:	ssl_DerivativeMonetaryNotionalAmountVolumeSettledContracts
Namespace Prefix:	ssl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal mass used to calculate payments on a derivative instrument, for open positions.

+ References

No definition available.

+ Details

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

- Definition

Nominal mass used to calculate payments on a derivative instrument, for contracts settled during the period.

+ References

No definition available.

+ Details

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

- Definition

Nominal volume used to calculate payments on a derivative instrument, for open positions.

+ References

No definition available.

+ Details

Name:	ssl_DerivativeNonmonetaryNotionalAmountVolumeOpenPositions
Namespace Prefix:	ssl_
Data Type:	dtr-types:volumeItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal volume used to calculate payments on a derivative instrument, for contracts settled during the period.

+ References

No definition available.

+ Details

Name:	ssl_DerivativeNonmonetaryNotionalAmountVolumeSettledContracts
Namespace Prefix:	ssl_
Data Type:	dtr-types:volumeItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ssl_CrudeOilPutOptionsPurchasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ssl_CrudeOilPutOptionsSoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ssl_CrudeOilZeroCostCollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ssl_CrudeOilSwapOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_FuturesContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ssl_EthaneSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ssl_CoalSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_ForwardContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ssl_ForeignExchangeZeroCostCollarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: