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Property, Plant, and Equipment | 12 Months Ended
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Apr. 28, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | Property, Plant, and Equipment Property, plant, and equipment balances and corresponding estimated useful lives were as follows:
(in millions) | April 28, 2017 |  | April 29, 2016 |  | Estimated Useful Lives (in years)
Land and land improvements | $ | 186 |  |  | $ | 215 |  |  | Up to 20 |
Buildings and leasehold improvements | 2,175 |  |  | 2,394 |  |  | Up to 40 |
Equipment | 6,435 |  |  | 6,328 |  |  | Generally 3-7, up to 15 |
Construction in progress | 895 |  |  | 777 |  |  | — |
Subtotal | 9,691 |  |  | 9,714 |  |  |  |
Less: Accumulated depreciation | (5,330 | ) |  | (4,873 | ) |  |  |
Property, plant, and equipment, net | $ | 4,361 |  |  | $ | 4,841 |  |  |  |
Depreciation is recognized using the straight-line method over the estimated useful lives of the assets. Depreciation expense of $937 million, $889 million, and $573 million was recognized in fiscal years 2017, 2016, and 2015, respectively. Upon retirement or disposal of property, plant, and equipment, the costs and related amounts of accumulated depreciation or amortization are eliminated from the asset and accumulated depreciation accounts. The difference, if any, between the net asset value and the proceeds, is recognized in earnings.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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