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Property, Plant, and Equipment | 12 Months Ended
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Sep. 02, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment | Property, Plant, and Equipment
As of | 2021 | 2020
Land | $ | 280 |  | $ | 352 |
Buildings | 14,776 |  | 13,981 |
Equipment(1) | 51,902 |  | 48,525 |
Construction in progress(2) | 1,517 |  | 1,600 |
Software | 987 |  | 873 |
| 69,462 |  | 65,331 |
Accumulated depreciation | (36,249) |  | (34,300) |
| $ | 33,213 |  | $ | 31,031 |
(1)Includes costs related to equipment not placed into service of $1.99 billion as of September 2, 2021 and $1.63 billion as of September 3, 2020. (2)Includes building-related construction, tool installation, and software costs for assets not placed into service. Depreciation expense was $6.13 billion, $5.57 billion, and $5.34 billion for 2021, 2020, and 2019, respectively. Interest capitalized as part of the cost of property, plant, and equipment was $66 million, $77 million, and $103 million for 2021, 2020, and 2019, respectively. We periodically assess the estimated useful lives of our property, plant, and equipment. Based on our assessment of planned technology node transitions, capital spending, and re-use rates, we revised the estimated useful lives of the existing equipment in our NAND wafer fabrication facilities and our research and development (“R&D”) facilities from five years to seven years as of the beginning of the first quarter of 2020. This revision reduced our aggregate depreciation expense by approximately $675 million in 2020, of which approximately $165 million remained capitalized in inventory as of the end of 2020. After adjusting for the effect of the reduced amount of depreciation expense remaining in inventory, the revision in estimated useful lives benefited both operating income and net income by approximately $510 million and diluted earnings per share by approximately $0.45 for 2020.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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