Quarterly Financial Data Net sales and gross profit (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 3,317	$ 3,469	$ 3,360	$ 3,401	$ 3,185	$ 3,246	$ 3,175	$ 3,248	$ 13,547	$ 12,854	$ 12,965
Gross Profit	$ 1,089	$ 1,176	$ 1,209	$ 1,252	$ 1,142	$ 1,172	$ 1,225	$ 1,160	$ 4,726	$ 4,699

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration