| Assets (liabilities) of benefit plan | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Net assets available for benefits at beginning of period | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Net assets available for benefits at end of period | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| The amount of 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 |
| Assi (obbligazzjonijiet) ta’ pjan ta’ benefiċċji | mt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| L-ammont ta’ assi ta’ pjan ta’ benefiċċji tal-irtirar mingħajr l-obbligazzjonijiet, minbarra l-valur attwarjali preżenti tal-benefiċċji għall-irtirar imwiegħda. | mt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Assi netti disponibbli għall-benefiċċji fil-bidu tal-perjodu | mt | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Assi netti disponibbli għall-benefiċċji fi tmiem il-perjodu | mt | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |