| The amount of other comprehensive income, before tax, related to the application of the overlay approach. [Refer: Other comprehensive income] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Other comprehensive income, before tax, application of overlay approach | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Other comprehensive income, before tax, application of overlay approach | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |