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Balance Sheet Account Details (Tables)
12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Short-term Investments
The following is a summary of short-term investments (in millions):
 
December 31, 2017
 
January 1, 2017
 
 
Amortized
Cost
 
Gross
Unrealized
Losses
 
 
Estimated
Fair Value
 
 
Amortized
Cost
 
Gross
Unrealized
Losses
 
 
Estimated
Fair Value
Available-for-sale securities:
Debt securities in government-sponsored entities
$
67

 
$

 
$
67

 
$
34

 
$

 
$
34

Corporate debt securities
423

 
(2
)
 
421

 
478

 
(2
)
 
476

U.S. Treasury securities
433

 
(1
)
 
432

 
316

 
(2
)
 
314

Total available-for-sale securities
$
923

 
$
(3
)
 
$
920

 
$
828

 
$
(4
)
 
$
824

Summary of Contractual Maturities of Available-for-sale Debt Securities
Contractual maturities of available-for-sale debt securities as of December 31, 2017 are as follows (in millions):
 
Estimated Fair Value
Due within one year
$
686

After one but within five years
234

Total
$
920


Summary of Accounts Receivable
Accounts receivable, net consist of the following (in millions):
 
December 31,
2017
 
January 1,
2017
Trade accounts receivable, gross
$
414

 
$
385

Allowance for doubtful accounts
(3
)
 
(4
)
Total accounts receivable, net
$
411

 
$
381

Summary of Inventory
Inventory consists of the following (in millions):
 
December 31,
2017
 
January 1,
2017
Raw materials
$
93

 
$
102

Work in process
188

 
161

Finished goods
52

 
37

Total inventory
$
333

 
$
300

Summary of Property and Equipment
The estimated useful lives of the major classes of property and equipment are generally as follows:
 
Estimated Useful Lives
Building and leasehold improvements
4 to 30 years
Machinery and equipment
3 to 5 years
Computer hardware and software
3 to 7 years
Furniture and fixtures
7 years
Property and equipment, net consists of the following (in millions):
 
December 31,
2017
 
January 1,
2017
Leasehold improvements
$
331

 
$
270

Machinery and equipment
316

 
274

Computer hardware and software
185

 
156

Furniture and fixtures
34

 
24

Building
155

 
9

Construction in progress
326

 
307

Total property and equipment, gross
1,347

 
1,040

Accumulated depreciation
(416
)
 
(327
)
Total property and equipment, net
$
931

 
$
713

Summary of Changes in Goodwill
Changes to goodwill balance from January 3, 2016 through December 31, 2017 are as follows (in millions):
 
Goodwill
Balance as of January 3, 2016
$
753

Acquisitions
23

Balance as of January 1, 2017
776

GRAIL deconsolidation
(5
)
Balance as of December 31, 2017
$
771

Summary of Accrued Liabilities
Accrued liabilities consist of the following (in millions):
 
December 31,
2017
 
January 1,
2017
Accrued compensation expenses
$
177

 
$
112

Deferred revenue, current portion
130

 
121

Accrued taxes payable
50

 
32

Customer deposits
20

 
20

Other, including warranties (a)
55

 
57

Total accrued liabilities
$
432

 
$
342

Summary of Changes in Reserve for Product Warranties
Changes in reserve for product warranties from December 28, 2014 through December 31, 2017 are as follows (in millions):
 
Warranty Reserve
Balance as of December 28, 2014
$
16

Additions charged to cost of revenue
28

Repairs and replacements
(27
)
Balance as of January 3, 2016
17

Additions charged to cost of revenue
21

Repairs and replacements
(25
)
Balance as of January 1, 2017
13

Additions charged to cost of revenue
26

Repairs and replacements
(22
)
Balance as of December 31, 2017
$
17

Summary of Activity of Redeemable Noncontrolling Interests
The activity of the redeemable noncontrolling interests from December 28, 2014 through December 31, 2017 is as follows (in millions):
 
Redeemable Noncontrolling Interests
Balance as of December 28, 2014
$

Cash contributions
57

Amount held in escrow by third party
(24
)
Net loss attributable to noncontrolling interests
(4
)
Adjustment up to the redemption value
4

Balance as of January 3, 2016
33

Cash contributions
9

Vesting of redeemable equity awards
2

Net loss attributable to noncontrolling interests
(21
)
Adjustment up to the redemption value
21

Balance as of January 1, 2017
44

Amount released from escrow
79

Vesting of redeemable equity awards
13

Net loss attributable to noncontrolling interests
(41
)
Adjustment up to the redemption value
136

Deconsolidation of GRAIL
(11
)
Balance as of December 31, 2017
$
220