| The amount of non-current accruals and non-current deferred income including non-current contract liabilities. [Refer: Accruals; Deferred income including contract liabilities] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Total non-current accruals and non-current deferred income including non-current contract liabilities | en | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| Non-current accruals and non-current deferred income including non-current contract liabilities | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |