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Property, Plant, and Equipment | 12 Months Ended
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Aug. 31, 2017
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | Property, Plant, and Equipment
As of |  | 2017 |  | 2016
Land |  | $ | 345 |  |  | $ | 145 |
Buildings (includes $475 and $347, respectively, under capital leases) |  | 7,958 |  |  | 6,653 |
Equipment(1) (includes $1,331 and $1,374, respectively, under capital leases) |  | 32,187 |  |  | 25,910 |
Construction in progress(2) |  | 499 |  |  | 475 |
Software |  | 544 |  |  | 422 |
|  | 41,533 |  |  | 33,605 |
Accumulated depreciation (includes $626 and $492, respectively, under capital leases) |  | (22,102 | ) |  | (18,919 | )
|  | $ | 19,431 |  |  | $ | 14,686 |
(1) | Included costs related to equipment not placed into service of $994 million and $1.47 billion, as of August 31, 2017 and September 1, 2016, respectively.
(2) | Included building-related construction and tool installation costs for assets not placed into service.
Depreciation expense was $3.76 billion, $2.86 billion, and $2.55 billion for 2017, 2016, and 2015, respectively. As of August 31, 2017, production equipment, buildings, and land with an aggregate carrying value of $6.14 billion were pledged as collateral under various notes payable. Interest capitalized as part of the cost of property, plant, and equipment was $7 million, $43 million, and $20 million for 2017, 2016, and 2015, respectively. In the fourth quarter of 2016, we revised the estimated useful lives of equipment in our DRAM wafer fabrication facilities from five to seven years, which reduced depreciation costs by approximately $100 million per quarter in 2017.

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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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