| Surplus (deficit) after tax | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total surplus (deficit) after tax | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Represents information pertaining to amount of surplus (deficit) after tax during the reporting date. | en | http://xbrl.ssm.com.my/role/ssm/rol_ssmt-mpers-cor_2017-12-31/ReportingDocumentation | http://www.xbrl.org/2003/role/link |
| Represents information pertaining to amount of surplus (deficit) after tax during the reporting date. | 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 |