Fair Value Measurements And Financial Instruments (Summary Of Components Of Available-For-Sale Securities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013	Dec. 29, 2012
Fair Value Disclosures [Abstract]
Adjusted cost	$ 7	$ 9
Available for sale securities gross unrealized gain accumulated in AOCI	26	32
Fair value	$ 33	$ 41

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

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