[["( millions except percentages )", "2012", "2011"], ["trade receivables net", "$ 2568", "$ 2512"], ["inventories fifo", "1930", "1839"], ["trade creditor's liabilities", "1620", "1612"], ["operating working capital", "$ 2878", "$ 2739"], ["operating working capital as % (  % ) of sales", "19.7% ( 19.7 % )", "19.5% ( 19.5 % )"]]