Financial Instruments (Details) (USD $)	3 Months Ended
	Mar. 29, 2013	Dec. 31, 2012	Mar. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Cash and Available for Sale Securities, Cost	$ 3,831,355,000	$ 3,716,677,000
Available-for-sale Securities Unrealized Gains	5,675,000	5,736,000
Available-for-Sale Securities Unrealized Losses	(60,000)	(70,000)
Cash and Cash Equivalents, at Carrying Value	2,953,587,000	2,876,627,000	3,420,182,000	3,371,933,000
Short-Term Marketable Securities	171,343,000	140,958,000
Long-Term Marketable Securities	712,040,000	704,758,000
Cash and Cash Equivalents, Fair Value Disclosure	3,836,970,000	3,722,343,000
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	187,633,000
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	706,482,000
Available-for-sale, Cost	894,115,000
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	187,690,000
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	712,040,000
Available-for-sale Securities, Fair Value Disclosure	899,730,000
Payments to Acquire Investments	4,700,000
Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	2,892,046,000	2,773,423,000
Available-for-sale Securities Unrealized Gains	5,130,000	5,231,000
Available-for-Sale Securities Unrealized Losses	0	3,000
Available-for-sale Securities, Fair Value Disclosure	3,448,900,000	3,309,845,000
Short-Term Marketable Securities	41,554,000	22,493,000
Long-Term Marketable Securities	515,300,000	513,929,000
Available-for-sale, Cost	3,443,770,000	3,304,617,000
Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	0	14,010,000
Available-for-sale Securities Unrealized Gains	545,000	505,000
Available-for-Sale Securities Unrealized Losses	(60,000)	(67,000)
Available-for-sale Securities, Fair Value Disclosure	326,529,000	323,304,000
Short-Term Marketable Securities	129,789,000	118,465,000
Long-Term Marketable Securities	196,740,000	190,829,000
Available-for-sale, Cost	326,044,000	322,866,000
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash, Cost	61,541,000	89,194,000
Available-for-sale Securities Unrealized Gains	0	0
Available-for-Sale Securities Unrealized Losses	0	0
Short-Term Marketable Securities	0	0
Long-Term Marketable Securities	0	0
Cash and Cash Equivalents, at Carrying Value	61,541,000	89,194,000
Cash [Member] | Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, at Carrying Value		89,194,000
Money Market Funds [Member] | Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	2,875,699,000	2,739,904,000
Available-for-sale Securities Unrealized Gains	0	0
Available-for-Sale Securities Unrealized Losses	0	0
Available-for-sale Securities, Fair Value Disclosure	2,875,699,000	2,739,904,000
Short-Term Marketable Securities	0	0
Long-Term Marketable Securities	0	0
Available-for-sale, Cost	2,875,699,000	2,739,904,000
US Treasury Securities [Member] | Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	16,347,000	33,519,000
Available-for-sale Securities Unrealized Gains	5,130,000	5,231,000
Available-for-Sale Securities Unrealized Losses	0	3,000
Available-for-sale Securities, Fair Value Disclosure	573,201,000	569,941,000
Short-Term Marketable Securities	41,554,000	22,493,000
Long-Term Marketable Securities	515,300,000	513,929,000
Available-for-sale, Cost	568,071,000	564,713,000
U.S Agency Securities [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	0	11,799,000
Available-for-sale Securities Unrealized Gains	50,000	58,000
Available-for-Sale Securities Unrealized Losses	(3,000)	(1,000)
Available-for-sale Securities, Fair Value Disclosure	106,115,000	116,859,000
Short-Term Marketable Securities	55,524,000	53,438,000
Long-Term Marketable Securities	50,591,000	51,622,000
Available-for-sale, Cost	106,068,000	116,802,000
Non-U.S Government Debt Securities [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	0	0
Available-for-sale Securities Unrealized Gains	5,000	10,000
Available-for-Sale Securities Unrealized Losses	(5,000)	(2,000)
Available-for-sale Securities, Fair Value Disclosure	16,611,000	11,652,000
Short-Term Marketable Securities	3,222,000	2,730,000
Long-Term Marketable Securities	13,389,000	8,922,000
Available-for-sale, Cost	16,611,000	11,644,000
Municipal Bonds [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	0	0
Available-for-sale Securities Unrealized Gains	1,000	1,000
Available-for-Sale Securities Unrealized Losses	0	0
Available-for-sale Securities, Fair Value Disclosure	613,000	1,373,000
Short-Term Marketable Securities	613,000	752,000
Long-Term Marketable Securities	0	621,000
Available-for-sale, Cost	612,000	1,372,000
Corporate Securities [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	0	2,211,000
Available-for-sale Securities Unrealized Gains	489,000	436,000
Available-for-Sale Securities Unrealized Losses	(52,000)	(64,000)
Available-for-sale Securities, Fair Value Disclosure	203,190,000	193,420,000
Short-Term Marketable Securities	70,430,000	61,545,000
Long-Term Marketable Securities	132,760,000	129,664,000
Available-for-sale, Cost	$ 202,753,000	$ 193,048,000