| Other comprehensive income before tax gains (losses) on other items | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Report the value, for the reporting period, of other comprehensive income on items that will not be reclassified subsequently to profit or loss not reported elsewhere in the statement. | en | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-mpers-cor_2017-12-31/ReportingDocumentation | http://www.xbrl.org/2003/role/link |
| Report the value, for the reporting period, of other comprehensive income on items that will not be reclassified subsequently to profit or loss not reported elsewhere in the statement. | en | http://xbrl.ssm.com.my/role/ssm/fs/mpers/lab_rol_ssmt-fs-mpers_2017-12-31/ReportingDocumentation | http://www.xbrl.org/2003/role/link |