Business Acquisitions - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 01, 2024	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024	Dec. 28, 2024
Business Acquisition [Line Items]
Goodwill		$ 4,147		$ 4,147		$ 3,887
Acquisition costs incurred		1	$ 2	4	$ 5
2025 Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration				290
Consideration paid				112
Noncontrolling interests				85
Estimated fair value of contingent consideration payable				11
Fair value of previously held equity method investments				81
Deferred consideration				1
Goodwill		130		130
Intangible assets		$ 116		116
Identifiable intangible assets acquired				116
2025 Acquisitions [Member] \| Customer Relationships and Lists [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired				$ 97
Estimated useful lives (in years)				10 years
2025 Acquisitions [Member] \| Trademarks And Trade Names [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired				$ 18
Estimated useful lives (in years)				6 years
2025 Acquisitions [Member] \| Non-compete Agreements [Member]
Business Acquisition [Line Items]
Identifiable intangible assets acquired				$ 1
Estimated useful lives (in years)				5 years
2025 Acquisitions [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired		60.00%		60.00%
2025 Acquisitions [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired		100.00%		100.00%
Acquisitions of Controlling Interests of Affiliates [Member]
Business Acquisition [Line Items]
Recognized gain related to remeasurement to fair value of previously held equity investment		$ 28	$ 19	$ 32	$ 19
TriMed, Inc. [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired	60.00%
Total consideration	$ 315					315
Consideration paid						141
Noncontrolling interests						153
Deferred consideration						21
Goodwill						124
Intangible assets						221
TriMed, Inc. [Member] \| Product Development [Member]
Business Acquisition [Line Items]
Intangible assets		204		$ 204
Estimated useful lives (in years)				9 years
TriMed, Inc. [Member] \| Trademarks And Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets		9		$ 9
Estimated useful lives (in years)				7 years
TriMed, Inc. [Member] \| In Process Research And Development [Member]
Business Acquisition [Line Items]
Intangible assets		$ 8		$ 8
Series Of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration						113
Consideration paid						62
Noncontrolling interests						18
Estimated fair value of contingent consideration payable						2
Fair value of previously held equity method investments						30
Deferred consideration						1
Goodwill						60
Intangible assets						64
Series Of Individually Immaterial Business Acquisitions [Member] \| Customer Relationships and Lists [Member]
Business Acquisition [Line Items]
Intangible assets						$ 33
Estimated useful lives (in years)						11 years
Series Of Individually Immaterial Business Acquisitions [Member] \| Product Development [Member]
Business Acquisition [Line Items]
Intangible assets						$ 5
Estimated useful lives (in years)						9 years
Series Of Individually Immaterial Business Acquisitions [Member] \| Trademarks And Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets						$ 24
Estimated useful lives (in years)						7 years
Series Of Individually Immaterial Business Acquisitions [Member] \| Non-compete Agreements [Member]
Business Acquisition [Line Items]
Intangible assets						$ 2
Estimated useful lives (in years)						5 years
Series Of Individually Immaterial Business Acquisitions [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired						51.00%
Series Of Individually Immaterial Business Acquisitions [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Percentage of voting interest acquired						100.00%

HENRY SCHEIN INC 10-Q