Accounts Receivable and Finance Receivables - Finance receivables (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 30, 2017
Finance Receivables
Finance receivables, gross	$ 792	$ 850
Allowance for losses	(29)	(31)
Total finance receivables, net	$ 763	$ 819

A valuation allowance for financing receivables that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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