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Property, Plant, and Equipment
 6 Months Ended
Mar. 02, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
Property, Plant, and Equipment

As of
 
September 1,
2016
 
Additions
 
Retirements and Other
 
March 2,
2017
Land
 
$
145

 
$
205

 
$
(2
)
 
$
348

Buildings
 
6,653

 
785

 
(12
)
 
7,426

Equipment(1) 
 
25,910

 
5,170

 
(254
)
 
30,826

Construction in progress(2)
 
475

 
(18
)
 
3

 
460

Software
 
422

 
11

 
(2
)
 
431

 
 
33,605

 
6,153

 
(267
)
 
39,491

Accumulated depreciation
 
(18,919
)
 
(1,720
)
 
246

 
(20,393
)
 
 
$
14,686

 
$
4,433

 
$
(21
)
 
$
19,098


(1) 
Included costs related to equipment not placed into service of $956 million and $1.47 billion as of March 2, 2017 and September 1, 2016, respectively.
(2) 
Included building-related construction and tool installation costs for assets not placed into service.

Depreciation expense was $976 million and $1.72 billion for the second quarter and first six months of 2017, respectively, and $745 million and $1.45 billion for the second quarter and first six 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.