Documentation: The disclosure of information about the extent of possible differences between the carrying amount and fair value of: (a) investments in equity instruments that do not have a quoted market price in an active market (or derivatives linked to such equity instruments) that are measured at cost because their fair value cannot be measured reliably; and (b) contracts containing a discretionary participation feature if the fair value of that feature cannot be measured reliably.
(For last 20-F submitted to SEC as of May 14, 2018)