| Remaining unamortised gains (losses) arising on buying reinsurance | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Remaining unamortised gains (losses) arising on buying reinsurance at beginning of period | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Remaining unamortised gains (losses) arising on buying reinsurance at end of period | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| The amount of unamortised deferred gains (losses) arising from the purchase of reinsurance. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Ganancias (pérdidas) no amortizadas restantes que surgen en la compra del reaseguro | es | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Ganancias (pérdidas) no amortizadas restantes que surgen en compras de reaseguro al inicio del periodo | es | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Ganancias (pérdidas) no amortizadas restantes que surgen en la compra del reaseguro al final del periodo | es | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |