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Other non-current assets	12 Months Ended
Other non-current assets	Dec. 31, 2017
Other non-current assets
Other noncurrent assets	10. Other non‑current assets At December 31, 2017 other non‑current assets of $25 million (2016: $21 million) include $10 million (2016: $6 million) relating to the Group’s investment in its joint ventures.