Segment Data (Business Segment Information) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2025 USD ($)	Sep. 28, 2024 USD ($)	Sep. 27, 2025 USD ($) segments	Sep. 28, 2024 USD ($)
Segment Data [Abstract]
Number of reportable segments \| segments			3
Segment Reporting Information [Line Items]
Net sales	$ 3,339	$ 3,174	$ 9,747	$ 9,482
Cost of sales	2,313	2,181	6,705	6,459
Operating income	164	157	490	466
Depreciation and amortization	80	74	229	221
Restructuring costs	34	48	82	73
Impairment of intangible assets			1	0
Global Distribution and Value-Added Services [Member]
Segment Reporting Information [Line Items]
Net sales	2,835	2,706	8,234	8,032
Global Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales	331	311	1,011	980
Global Technology [Member]
Segment Reporting Information [Line Items]
Net sales	173	157	502	470
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	3,382	3,216	9,871	9,606
Cost of sales	2,361	2,227	6,840	6,594
Operating expenses	726	721	2,215	2,246
Operating income	295	268	816	766
Depreciation and amortization	27	22	74	66
Operating Segments [Member] \| Global Distribution and Value-Added Services [Member]
Segment Reporting Information [Line Items]
Net sales	2,840	2,711	8,247	8,058
Cost of sales	2,138	2,025	6,176	5,964
Operating expenses	524	502	1,567	1,563
Operating income	178	184	504	531
Depreciation and amortization	7	7	20	19
Operating Segments [Member] \| Global Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales	369	348	1,122	1,078
Cost of sales	165	152	501	478
Operating expenses	133	151	442	472
Operating income	71	45	179	128
Depreciation and amortization	11	7	28	21
Operating Segments [Member] \| Global Technology [Member]
Segment Reporting Information [Line Items]
Net sales	173	157	502	470
Cost of sales	58	50	163	152
Operating expenses	69	68	206	211
Operating income	46	39	133	107
Depreciation and amortization	9	8	26	26
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	(33)	(25)	(99)	(55)
Depreciation and amortization	7	5	22	15
Adjustments [Member]
Segment Reporting Information [Line Items]
Net sales	(43)	(42)	(124)	(124)
Operating income	(98)	(86)	(227)	(245)
Depreciation and amortization	46	47	133	140
Restructuring costs	(34)	(48)	(82)	(73)
Acquisition intangible amortization	(46)	(47)	(133)	(140)
Cyber incident-insurance proceeds, net of third-party advisory expenses	0	9	20	11
Change in contingent consideration	(6)	0	(4)	(38)
Litigation settlements	(2)	0	(3)	(5)
Impairment of intangible assets	0	0	(1)	0
Costs associated with shareholder advisory matters and select value creation consulting costs	(10)	0	(24)	0
Adjustments [Member] \| Global Distribution and Value-Added Services [Member]
Segment Reporting Information [Line Items]
Net sales	(5)	(5)	(13)	(26)
Adjustments [Member] \| Global Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales	(38)	(37)	(111)	(98)
Adjustments [Member] \| Global Technology [Member]
Segment Reporting Information [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0

HENRY SCHEIN INC 10-Q