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Inventories	6 Months Ended
Inventories	Oct. 31, 2015
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 $234 million higher than reported as of April 30, 2015, and $243 million higher than reported as of October 31, 2015. Changes in the LIFO valuation reserve for interim periods are based on a proportionate allocation of the estimated change for the entire fiscal year.