| Other cash receipts from sales of interests in joint ventures, classified as investing activities | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Other cash receipts from sales of interests in joint ventures | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| The cash inflow from sales of interests in joint ventures (other than receipts for those instruments considered to be cash equivalents and those held for dealing or trading purposes), classified as investing activities. [Refer: Joint ventures [member]] | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Fáltais airgid eile ó dhíolachán leasanna i gcomhfhiontair, a aicmítear mar ghníomhaíochtaí infheistíochta | ga | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| An t‑insreabhadh airgid ó dhíolachán leasanna i gcomhfhiontair (seachas fáltais maidir leis na hionstraimí sin a bhreithnítear mar choibhéisí airgid agus iad sin arna sealbhú chun críocha déileála nó trádála), a aicmítear mar ghníomhaíochtaí infheistíochta. [Féach: Comhfhiontair [member]] | ga | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Fáltais airgid eile ó dhíolachán leasanna i gcomhfhiontair | ga | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |