Reconciliation of the Change in Fair Value of the Pension Plan Assets Calculated based on Level 3 Inputs (Detail) - UK - USD ($) $ in Millions	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017
Schedule of Pension Plan Assets by Fair Value [Line Items]
Currency translation	$ (18)	$ 27
Significant Unobservable Inputs (Level 3)
Schedule of Pension Plan Assets by Fair Value [Line Items]
Balance at December 30, 2017	20
Currency translation	(1)
Balance at December 29, 2018	$ 19	$ 20

Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant