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. 28, 2024		Sep. 30, 2023		Oct. 01, 2022
Fair value of plans' assets
Contributions	$ 95
Pension Plans
Projected benefit obligations
Beginning obligations	(14,690)		$ (15,028)
Service cost	(248)		(282)		$ (400)
Interest cost	(834)		(784)		(500)
Actuarial gain (loss)	(1,667)	[1]	757
Plan amendments and other	44		14	[2]
Benefits Paid	661		633
Ending obligations	(16,734)		(14,690)		(15,028)
Fair value of plans' assets
Beginning fair value	15,442		14,721
Actual return on plan assets	2,789		1,324
Contributions	69		73
Benefits paid	(661)		(633)
Expenses and other	(82)		(43)
Ending fair value	17,557		15,442		14,721
Overfunded (Underfunded) status of the plans	823		752
Amounts recognized in the balance sheet
Non-current assets	2,192		1,971
Current liabilities	(77)		(72)
Non-current liabilities	(1,292)		(1,147)
Amounts for Asset (Liability) Recognized in the Balance Sheet, Total	823		752
Postretirement Medical Plans
Projected benefit obligations
Beginning obligations	(961)		(1,539)
Service cost	(1)		(5)		(9)
Interest cost	(55)		(81)		(51)
Actuarial gain (loss)	6	[1]	59
Plan amendments and other	(13)		539	[2]
Benefits Paid	56		66
Ending obligations	(968)		(961)		(1,539)
Fair value of plans' assets
Beginning fair value	781		749
Actual return on plan assets	143		71
Contributions	26		29
Benefits paid	(56)		(66)
Expenses and other	(2)		(2)
Ending fair value	892		781		$ 749
Overfunded (Underfunded) status of the plans	(76)		(180)
Amounts recognized in the balance sheet
Non-current assets	303		209
Current liabilities	(1)		(2)
Non-current liabilities	(378)		(387)
Amounts for Asset (Liability) Recognized in the Balance Sheet, Total	$ (76)		$ (180)

[1] The actuarial loss for fiscal 2024 was primarily due to a decrease in the discount rate used to determine the fiscal year-end benefit obligation from the rate that was used in the preceding fiscal year

[2] The amount in fiscal 2023 was due to a change in postretirement medical benefit options.