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Inventories	3 Months Ended
Inventories	Jul. 31, 2016
Inventory Disclosure [Abstract]
Inventories	Inventories We use the last-in, first-out (LIFO) method to determine the cost of most of our inventories. If the LIFO method had not been used, inventories at current cost would have been $248 million higher than reported as of April 30, 2016, and $253 million higher than reported as of July 31, 2016. Changes in the LIFO valuation reserve for interim periods are based on a proportionate allocation of the estimated change for the entire fiscal year.