Pension and Other Benefit Programs - Benefit Obligations, Assets, Funded Status and Balance Sheet Impacts Associated with Pension and Postretirement Medical Benefit Plans based upon Actuarial Valuations (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2025		Sep. 28, 2024		Sep. 30, 2023
Fair value of plans' assets
Contributions	$ 98
Pension Plans
Projected benefit obligations
Beginning obligations	(16,734)		$ (14,690)
Service cost	(264)		(248)		$ (282)
Interest cost	(783)		(834)		(784)
Actuarial gain (loss)	716		(1,667)	[1]
Benefits Paid	716		661
Other	19		44
Ending obligations	(16,330)		(16,734)		(14,690)
Fair value of plans' assets
Beginning fair value	17,557		15,442
Actual return on plan assets	699		2,789
Contributions	71		69
Benefits paid	(716)		(661)
Expenses and other	(67)		(82)
Ending fair value	17,544		17,557		15,442
Overfunded (Underfunded) status of the plans	1,214		823
Amounts recognized in the balance sheet
Non-current assets	2,565		2,192
Current liabilities	(79)		(77)
Non-current liabilities	(1,272)		(1,292)
Amounts for Asset (Liability) Recognized in the Balance Sheet, Total	1,214		823
Postretirement Medical Plans
Projected benefit obligations
Beginning obligations	(968)		(961)
Service cost	(1)		(1)		(5)
Interest cost	(45)		(55)		(81)
Actuarial gain (loss)	30	[1]	6
Benefits Paid	56		56
Other	(9)		(13)
Ending obligations	(937)		(968)		(961)
Fair value of plans' assets
Beginning fair value	892		781
Actual return on plan assets	36		143
Contributions	27		26
Benefits paid	(56)		(56)
Expenses and other	(2)		(2)
Ending fair value	897		892		$ 781
Overfunded (Underfunded) status of the plans	(40)		(76)
Amounts recognized in the balance sheet
Non-current assets	324		303
Current liabilities	(1)		(1)
Non-current liabilities	(363)		(378)
Amounts for Asset (Liability) Recognized in the Balance Sheet, Total	$ (40)		$ (76)

[1] Primarily reflects updates to the discount rate used to determine the fiscal year-end benefit obligation from the rate that was used in the preceding fiscal year