Multipemployer Pension and Postretirement Plans Multiemployer Pension Plans Trusts Funds Contributions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Multiemployer Plans [Line Items]
Collective-Bargaining Arrangement, percentage of total contributions	5.00%
Multiemployer Plans, Withdrawal Obligation	$ 32	$ 28
Multiemployer plan withdrawal obligation term	20 years
Multiemployer withdrawal liability payments	$ 3
Project K
Multiemployer Plans [Line Items]
Multiemployer plan withdrawal expense	$ 7	$ 26	$ 0

Percentage of contributions required of employer under collective bargaining arrangement to total contributions required under all collective bargaining arrangements for pension and other postretirement plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

Name:	us-gaap_MultiemployerPlanCollectiveBargainingArrangementPercentageOfContributionsRequiredForMultipleCollectiveBargainingArrangements
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration