Fair Value Measurements (Narrative) (Details) (USD $)	Mar. 29, 2014	Dec. 31, 2013	Dec. 31, 2013 Level 3 [Member]	Dec. 31, 2012 Level 3 [Member]	Mar. 29, 2014 Estimate of Fair Value, Fair Value Disclosure [Member] Level 2 [Member]	Mar. 29, 2014 Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 3 holdings			$ 0	$ 0
Investments in money market mutual funds classified as cash and cash equivalents	2,100,000,000	2,100,000,000
Long-term debt, Fair Value					$ 2,600,000,000	$ 2,500,000,000