Property, Plant, and Equipment

12 Months Ended

Apr. 28, 2017

Property, Plant and Equipment [Abstract]

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.