Financial Instruments (Details 4) (USD $)	Sep. 26, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	113	137
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,200,000,000	$ 1,600,000,000
Available-for-Sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Accumulated in Investments	$ 8,200,000	$ 28,400,000