| Increase (decrease) in net assets available for benefits | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total increase (decrease) in net assets available for benefits | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The increase (decrease) in net assets available for benefits. Net assets available for benefits are assets of a retirement benefit plan less liabilities other than the actuarial present value of promised retirement benefits. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Żieda (tnaqqis) fl-assi netti disponibbli għall-benefiċċji | mt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Iż-żieda (it-tnaqqis) fl-assi netti disponibbli għall-benefiċċji. Assi netti disponibbli għall-benefiċċji huma l-assi ta’ pjan ta’ benefiċċji tal-irtirar wara li jitnaqqsu l-obbligazzjonijiet, għajr il-valur attwarjali preżenti tal-benefiċċji għall-irtirar imwiegħda. | mt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Żieda (tnaqqis) totali fl-assi netti disponibbli għall-benefiċċji | mt | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |