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Financial Instruments (Summary of Derivative Instruments) (Details) - USD ($) $ in Millions | Sep. 29, 2018 | Dec. 30, 2017
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Level 2 | Cash Flow Hedging | Foreign Currency Forward Contracts |  |
Foreign Currency Forward Contracts - gains (losses) |  |
Contracts designated as cash flow hedging instruments | $ (10) | $ 7

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- Definition Fair value as of the balance sheet date of all derivatives designated as foreign currency fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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