Notes to the consolidated annual financial statements l Note 19   Rm 2016   2015   19. Trade and other payables           Trade payables 9 335   7 918     Capital expenditure creditors 3 963   4 088     Value added tax 1 268   1 175     Accruals 4 883   3 962     Deferred revenue 3 306   3 332     Derivative financial liabilities 169   95     Other 736   778       23 660   21 348     Timing           Non-current 815   759     Current 22 845   20 589       23 660   21 348     Trade payables are carried at cost which normally approximates fair value due to short-term maturity.           Included within derivative financial liabilities:           Cash flow hedges:              Interest rate swaps –   6     Fair value hedges:              Foreign exchange forward contracts 132   43        Firm commitment liability – fair value hedge 37   46       169   95     The fair value of foreign exchange forward contracts is determined with reference to quoted market prices for similar instruments, being the mid forward rates as at the reporting dates. During the prior year the Group designated certain foreign exchange forward contracts as fair value hedges to hedge its exposure to variability in the fair value that is attributable to changes in foreign exchange rates.