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

The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph B8
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B
-URIDate 2022-03-24

Name:	ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

The increase (decrease) in annual net interest charge as a result of an increase in the relevant risk variable that was reasonably possible at the end of the reporting period.

No definition available.

Name:	snn_IncreaseDecreaseInAnnualNetInterestChargeDueToReasonablyPossibleIncreaseInRiskVariable
Namespace Prefix:	snn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The reasonably possible percentage of decrease in the relevant risk variable used to determine the financial impact in a sensitivity analysis.

No definition available.

Name:	snn_SensitivityAnalysisPercentageOfReasonablyPossibleDecreaseInRiskVariable
Namespace Prefix:	snn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The reasonably possible percentage of increase in the relevant risk variable used to determine the financial impact in a sensitivity analysis.

No definition available.