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Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 02, 2016	Dec. 31, 2015
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	$ 2,174,339	$ 2,043,996
Unrealized Gain	1,752	245
Unrealized Loss	(692)	(2,474)
Fair Value	2,175,399	2,041,767
Debt securities due in one year or less	1,214,006	1,137,825
Due after one year through three years	854,838	828,848
Total debt securities	2,068,844	1,966,673
Cash Equivalents [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	86,618	130,169
Fair Value	86,618	130,169
Investments [Member]
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	2,087,721	1,913,827
Unrealized Gain	1,752	245
Unrealized Loss	(692)	(2,474)
Fair Value	2,088,781	1,911,598
US Treasury Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	607,957	628,358
Unrealized Gain	621	16
Unrealized Loss	(41)	(1,218)
US Treasury Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	608,537	627,156
Foreign Government Debt Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	27,008	15,216
Unrealized Gain	6
Unrealized Loss	(3)	(17)
Foreign Government Debt Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	27,011	15,199
Corporate Debt Securities
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	1,432,889	1,325,398
Unrealized Gain	1,055	159
Unrealized Loss	(648)	(1,239)
Corporate Debt Securities | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	1,433,296	1,324,318
Time Deposits
Schedule of Available-for-Sale Securities [Line Items]
Amortized Cost	106,408	74,947
Time Deposits | Fair Value Measurements, Recurring
Schedule of Available-for-Sale Securities [Line Items]
Fair Value	106,408	74,947
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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