Pensions and Other Post-retirement Benefit Plans - Unfunded Amounts Recognized on Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Jan. 03, 2020	Jun. 28, 2019
Retirement Benefits [Abstract]
Current liabilities	$ 1	$ 1
Non-current liabilities	67	71
Net amount recognized	$ 68	$ 72

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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