| Contributions to plan by plan participants, net defined benefit liability (asset) | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Contributions to plan by plan participants, net defined benefit liability (asset) | en | http://www.xbrl.org/2009/role/negatedLabel | http://www.xbrl.org/2003/role/link |
| The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Kontribuzzjonijiet għal pjan mill-parteċipanti fil-pjan, obbligazzjoni (assi) ta’ benefiċċju definit nett | mt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| It-tnaqqis (iż-żieda) fl-obbligazzjoni (assi) ta’ benefiċċju definit nett li jirriżultaw minn kontribuzzjonijiet għal pjan ta’ benefiċċju definit mill-parteċipanti fil-pjan. [Refer: Obbligazzjoni (assi) tal-benefiċċju definit nett; Pjanijiet ta’ benefiċċju definit [member]] | mt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |