Financial Instruments (Summary of Derivative Instruments) (Details) - Level 2 - Cash Flow Hedging - Foreign Currency Forward Contracts - USD ($) $ in Millions	Sep. 28, 2019	Dec. 29, 2018
Foreign Currency Forward Contracts - gains (losses)
Contracts designated as cash flow hedging instruments - gains	$ 1	$ 1
Contracts designated as cash flow hedging instruments - losses	$ (7)	$ (8)

Fair value as of the balance sheet date of all derivative liabilities designated as foreign currency fair value hedging instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

Name:	us-gaap_ForeignCurrencyFairValueHedgeLiabilityAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant