| Other comprehensive income, net of tax, gains (losses) on other items | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Represents the amount of other comprehensive income, net of tax other equity instruments that will not be reclassified to profit or loss. | en | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-mpers-cor_2017-12-31/ReportingDocumentation | http://www.xbrl.org/2003/role/link |
| Represents the amount of other comprehensive income, net of tax other equity instruments that will not be reclassified to profit or loss. | 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 |