| Purchase of other investment | en | http://www.xbrl.org/2009/role/negatedTerseLabel | http://www.xbrl.org/2003/role/link |
| Purchase of investments other than investments accounted for using equity method | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| The cash outflow for the purchase of investments other than investments accounted for using equity method. [Refer: Investments accounted for using equity method; Investments other than investments accounted for using equity method] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |