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Marketable Securities (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Dec. 31, 2016
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 2,725,167	$ 2,434,145
Unrealized Gain	1,638	819
Unrealized Loss	(2,206)	(2,769)
Fair Value	2,724,599	2,432,195
Debt securities due in one year or less	1,591,388	1,388,537
Debt securities due after one year through three years	837,219	843,605
Total debt securities	2,428,607	2,232,142
Cash Equivalents [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	165,909	124,793
Unrealized Gain		1
Unrealized Loss	(1)
Fair Value	165,908	124,794
Investments [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	2,559,258	2,309,352
Unrealized Gain	1,638	818
Unrealized Loss	(2,205)	(2,769)
Fair Value	2,558,691	2,307,401
US Treasury Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	627,443	570,695
Unrealized Gain	104	253
Unrealized Loss	(960)	(635)
US Treasury Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	626,587	570,313
Foreign Government Debt Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	6,971	17,999
Unrealized Gain	1
Unrealized Loss	(3)	(8)
Foreign Government Debt Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	6,969	17,991
Corporate Debt Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	1,794,831	1,645,468
Unrealized Gain	1,463	496
Unrealized Loss	(1,243)	(2,126)
Corporate Debt Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	1,795,051	1,643,838
Time Deposits
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	295,845	199,906
Time Deposits | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	295,845	199,906
Equity Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	77	77
Unrealized Gain	70	70
Equity Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	$ 147	$ 147

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