Balance Sheet Account Details (Tables)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Short-term Investments

The following is a summary of short-term investments (in millions):

	September 30, 2018							December 31, 2017
	Amortized Cost		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale debt securities:
Debt securities in government sponsored entities	$	21	$	—		$	21	$	67	$	—		$	67
Corporate debt securities	1,063		(3		)	1,060		423		(2		)	421
U.S. Treasury securities	964		(2		)	962		433		(1		)	432
Total available-for-sale debt securities	$	2,048	$	(5	)	$	2,043	$	923	$	(3	)	$	920

Summary of Contractual Maturities of Available-for-sale Debt Securities

Contractual maturities of available-for-sale debt securities as of September 30, 2018 were as follows (in millions):

	Estimated Fair Value
Due within one year	$	1,253
After one but within five years	790
Total	$	2,043

Summary of Inventory

Inventory consisted of the following (in millions):

	September 30, 2018		December 31, 2017
Raw materials	$	98	$	93
Work in process	224		188
Finished goods	52		52
Total inventory	$	374	$	333

Summary of Property and Equipment

Property and equipment, net consisted of the following (in millions):

	September 30, 2018			December 31, 2017
Leasehold improvements	$	505		$	331
Machinery and equipment	352			316
Computer hardware and software	207			185
Furniture and fixtures	43			34
Buildings	279			155
Construction in progress	156			326
Total property and equipment, gross	1,542			1,347
Accumulated depreciation	(482		)	(416		)
Total property and equipment, net	$	1,060		$	931

Summary of Changes in Goodwill

Changes to goodwill during the nine months ended September 30, 2018 were as follows (in millions):

	Goodwill
Balance as of December 31, 2017	$	771
Current period acquisitions	60
Balance as of September 30, 2018	$	831

Summary of Accrued Liabilities

Accrued liabilities consisted of the following (in millions):

	September 30, 2018		December 31, 2017
Contract liabilities, current portion	$	154	$	150
Accrued compensation expenses	154		177
Accrued taxes payable	94		50
Other	48		55
Total accrued liabilities	$	450	$	432

Summary of Changes in Reserve for Product Warranties

Changes in the reserve for product warranties during the three and nine months ended September 30, 2018 and October 1, 2017 were as follows (in millions):

	Three Months Ended						Nine Months Ended
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Balance at beginning of period	$	15		$	14		$	17		$	13
Additions charged to cost of product revenue	8			7			20			18
Repairs and replacements	(6		)	(5		)	(20		)	(15		)
Balance at end of period	$	17		$	16		$	17		$	16

Summary of Activity of Redeemable Noncontrolling Interests

The activity of the redeemable noncontrolling interests during the nine months ended September 30, 2018 was as follows (in millions):

	Redeemable Noncontrolling Interests
Balance as of December 31, 2017	$	220
Vesting of redeemable equity awards	2
Net loss attributable to noncontrolling interests	(25		)
Adjustment up to the redemption value	21
Balance as of September 30, 2018	$	218