Postemployment Benefits - Pension Plans - Changes in Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Details) - USD ($)	12 Months Ended
	Dec. 27, 2025	Dec. 28, 2024	Dec. 30, 2023	Sep. 27, 2025
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Type [Extensible Enumeration]	Pension Benefits
U.S. Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets				$ 29,000,000
Pension Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 4,341,000,000
Fair value of plan assets at end of year	4,226,000,000	$ 4,341,000,000
Pension Benefits \| U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	2,461,000,000	2,681,000,000
Service cost	1,000,000	1,000,000	$ 2,000,000
Interest cost	121,000,000	135,000,000	142,000,000
Benefits paid	(148,000,000)	(212,000,000)
Actuarial losses/(gains)	188,000,000	(144,000,000)
Currency	0	0
Settlements	(309,000,000)	0
Special/contractual termination benefits	0	0
Other	0	0
Benefit obligation at end of year	2,314,000,000	2,461,000,000	2,681,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	2,973,000,000	3,139,000,000
Actual return on plan assets	244,000,000	46,000,000
Employer contributions	0	0
Benefits paid	(148,000,000)	(212,000,000)
Currency	0	0
Settlements	(309,000,000)	0
Fair value of plan assets at end of year	2,760,000,000	2,973,000,000	3,139,000,000
Net pension liability/(asset) recognized at end of year	(446,000,000)	(512,000,000)
Fair value of plan assets	0	0
Pension Benefits \| Non-U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,065,000,000	1,210,000,000
Service cost	6,000,000	7,000,000	7,000,000
Interest cost	58,000,000	55,000,000	65,000,000
Benefits paid	(83,000,000)	(77,000,000)
Actuarial losses/(gains)	(28,000,000)	(124,000,000)
Currency	72,000,000	(19,000,000)
Settlements	0	0
Special/contractual termination benefits	1,000,000	0
Other	12,000,000	0
Benefit obligation at end of year	1,107,000,000	1,065,000,000	1,210,000,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,368,000,000	1,528,000,000
Actual return on plan assets	78,000,000	(43,000,000)
Employer contributions	5,000,000
Benefits paid	(83,000,000)	(77,000,000)
Currency	98,000,000	(18,000,000)
Settlements	0	0
Fair value of plan assets at end of year	1,466,000,000	1,368,000,000	$ 1,528,000,000
Net pension liability/(asset) recognized at end of year	(359,000,000)	(303,000,000)
Fair value of plan assets	$ 15,000,000	31,000,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement, Pre-Tax		$ 162,000,000

Kraft Heinz Co 10-K