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Property, Plant, and Equipment
 9 Months Ended
Jun. 01, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
Property, Plant, and Equipment

As of
 
September 1,
2016
 
Additions
 
Retirements and Other
 
June 1,
2017
Land
 
$
145

 
$
205

 
$
(5
)
 
$
345

Buildings
 
6,653

 
946

 
(30
)
 
7,569

Equipment(1) 
 
25,910

 
5,934

 
(495
)
 
31,349

Construction in progress(2)
 
475

 
56

 
33

 
564

Software
 
422

 
21

 
(1
)
 
442

 
 
33,605

 
7,162

 
(498
)
 
40,269

Accumulated depreciation
 
(18,919
)
 
(2,714
)
 
378

 
(21,255
)
 
 
$
14,686

 
$
4,448

 
$
(120
)
 
$
19,014


(1) 
Included costs related to equipment not placed into service of $731 million and $1.47 billion as of June 1, 2017 and September 1, 2016, respectively.
(2) 
Included building-related construction and tool installation costs for assets not placed into service.

Depreciation expense was $994 million and $2.71 billion for the third quarter and first nine months of 2017, respectively, and $725 million and $2.18 billion for the third quarter and first nine months of 2016, 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.