Financial Instruments (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 28, 2013	Dec. 31, 2012	Jun. 29, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Cash and Available for Sale Securities, Cost	$ 3,646,485,000	$ 3,716,677,000
Available-for-sale Securities Unrealized Gains	288,000	5,736,000
Available-for-Sale Securities Unrealized Losses	(3,793,000)	(70,000)
Investments, Fair Value Disclosure	3,642,980,000	3,722,343,000
Cash and Cash Equivalents, at Carrying Value	2,788,844,000	2,876,627,000	2,884,063,000	3,371,933,000
Short-Term Marketable Securities	164,835,000	140,958,000
Long-Term Marketable Securities	689,301,000	704,758,000
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	182,408,000
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	692,832,000
Available-for-sale, Cost	875,240,000
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	182,434,000
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	689,301,000
Available-for-sale Securities, Fair Value Disclosure	871,735,000
Payments to Acquire Investments	5,100,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	702,600,000	118,700,000
Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	3,277,730,000	3,309,845,000
Cash and Cash Equivalents, Fair Value Disclosure	2,726,985,000	2,773,423,000
Available-for-sale Securities Unrealized Gains	6,000	5,231,000
Available-for-Sale Securities Unrealized Losses	(3,376,000)	(3,000)
Short-Term Marketable Securities	36,809,000	22,493,000
Long-Term Marketable Securities	513,936,000	513,929,000
Available-for-sale, Cost	3,281,100,000	3,304,617,000
Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	303,391,000	323,304,000
Cash and Cash Equivalents, Fair Value Disclosure	0	14,010,000
Available-for-sale Securities Unrealized Gains	282,000	505,000
Available-for-Sale Securities Unrealized Losses	(417,000)	(67,000)
Short-Term Marketable Securities	128,026,000	118,465,000
Long-Term Marketable Securities	175,365,000	190,829,000
Available-for-sale, Cost	303,526,000	322,866,000
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash, Cost	61,859,000	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, Fair Value Disclosure	61,859,000	89,194,000
Money Market Funds [Member] | Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	2,709,386,000	2,739,904,000
Cash and Cash Equivalents, Fair Value Disclosure	2,709,386,000	2,739,904,000
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
Available-for-sale, Cost	2,709,386,000	2,739,904,000
US Treasury Securities [Member] | Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	568,344,000	569,941,000
Cash and Cash Equivalents, Fair Value Disclosure	17,599,000	33,519,000
Available-for-sale Securities Unrealized Gains	6,000	5,231,000
Available-for-Sale Securities Unrealized Losses	(3,376,000)	(3,000)
Short-Term Marketable Securities	36,809,000	22,493,000
Long-Term Marketable Securities	513,936,000	513,929,000
Available-for-sale, Cost	571,714,000	564,713,000
U.S Agency Securities [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	83,119,000	116,859,000
Cash and Cash Equivalents, Fair Value Disclosure	0	11,799,000
Available-for-sale Securities Unrealized Gains	26,000	58,000
Available-for-Sale Securities Unrealized Losses	(59,000)	(1,000)
Short-Term Marketable Securities	41,992,000	53,438,000
Long-Term Marketable Securities	41,127,000	51,622,000
Available-for-sale, Cost	83,152,000	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	16,070,000	11,652,000
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Available-for-sale Securities Unrealized Gains	2,000	10,000
Available-for-Sale Securities Unrealized Losses	(6,000)	(2,000)
Short-Term Marketable Securities	6,758,000	2,730,000
Long-Term Marketable Securities	9,312,000	8,922,000
Available-for-sale, Cost	16,074,000	11,644,000
Municipal Bonds [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	1,597,000	1,373,000
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Available-for-sale Securities Unrealized Gains	0	1,000
Available-for-Sale Securities Unrealized Losses	(12,000)	0
Short-Term Marketable Securities	608,000	752,000
Long-Term Marketable Securities	989,000	621,000
Available-for-sale, Cost	1,609,000	1,372,000
Corporate Securities [Member] | Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	202,605,000	193,420,000
Cash and Cash Equivalents, Fair Value Disclosure	0	2,211,000
Available-for-sale Securities Unrealized Gains	254,000	436,000
Available-for-Sale Securities Unrealized Losses	(340,000)	(64,000)
Short-Term Marketable Securities	78,668,000	61,545,000
Long-Term Marketable Securities	123,937,000	129,664,000
Available-for-sale, Cost	$ 202,691,000	$ 193,048,000