Suppose the following items were taken from the December 31, 2017, assets section of the Waterway Industries balance sheet. (All dollars are in millions.) Inventory Notes receivable-due after December 31, 2018 Notes receivable-due before December 31, 2018 Accumulated depreciation-buildings $17,330 Patents $13,390 5,490 Buildings 21,590 385 Cash 8,700 12,530 Accounts receivable 5,670 Debt investments (short-term) 1,670