| Accumulated other comprehensive income | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Total accumulated other comprehensive income | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Outro rendimento integral acumulado | pt | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| A quantia dos itens acumulados dos rendimentos e despesas (incluindo ajustamentos de reclassificação) que não são reconhecidos nos resultados conforme exigido ou permitido por outras IFRS. [Consultar: IFRS [member]; Outro rendimento integral] | pt | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Total de outro rendimento integral acumulado | pt | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |