| Group [member] | Company [member] | ||
| Trade and other payables [abstract] | |||
| Trade and other payables [abstract] | |||
| Trade payables due to contract customers | |||
| Trade payables due to holding company | |||
| Trade payables due to subsidiaries | |||
| Trade payables due to associates | |||
| Trade payables due to joint ventures | |||
| Trade payables due to other related parties | |||
| Other trade payables | |||
| Total trade payables | |||
| Other payables [abstract] | |||
| Other payables due to related parties [abstract] | |||
| Other payables due to holding company | |||
| Other payables due to subsidiaries | |||
| Other payables due to associates | |||
| Other payables due to joint ventures | |||
| Other payables due to other related parties | |||
| Total other payables due to related parties | |||
| Non-trade payables [abstract] | |||
| Deferred income | |||
| Accruals | |||
| Retention payables | |||
| Other non-trade payables | |||
| Total non-trade payables | |||
| Total other payables | |||
| Total trade and other payables | |||