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
		Oct. 01, 2022	Oct. 02, 2021	Oct. 03, 2020
Fair value of plans' assets
Contributions		$ 157
Amounts recognized in the balance sheet
Non-current liabilities		(1,940)	$ (4,132)
Net balance sheet liability		(1,097)
Pension Plans
Projected benefit obligations
Beginning obligations		(20,955)	(20,760)
Service cost		(400)	(434)	$ (410)
Interest cost		(500)	(457)	(527)
Actuarial gain (loss)	[1]	6,159	15
Plan amendments and other		39	20
Benefits Paid		629	661
Ending obligations		(15,028)	(20,955)	(20,760)
Fair value of plans' assets
Beginning fair value		18,076	15,598
Actual return on plan assets		(2,715)	2,653
Contributions		96	565
Benefits paid		(629)	(661)
Expenses and other		107	79
Ending fair value		14,721	18,076	15,598
Underfunded status of the plans		(307)	(2,879)
Amounts recognized in the balance sheet
Non-current assets		913	88
Current liabilities		(66)	(63)
Non-current liabilities		(1,154)	(2,904)
Net balance sheet liability		(307)	(2,879)
Postretirement Medical Plans
Projected benefit obligations
Beginning obligations		(2,121)	(2,104)
Service cost		(9)	(10)	(10)
Interest cost		(51)	(47)	(56)
Actuarial gain (loss)	[1]	595	(13)
Plan amendments and other		(16)	(14)
Benefits Paid		63	67
Ending obligations		(1,539)	(2,121)	(2,104)
Fair value of plans' assets
Beginning fair value		889	771
Actual return on plan assets		(134)	137
Contributions		61	47
Benefits paid		(63)	(67)
Expenses and other		(4)	1
Ending fair value		749	889	$ 771
Underfunded status of the plans		(790)	(1,232)
Amounts recognized in the balance sheet
Non-current assets		0	0
Current liabilities		(4)	(4)
Non-current liabilities		(786)	(1,228)
Net balance sheet liability		$ (790)	$ (1,232)

[1] The actuarial gain for fiscal 2022 was due to an increase in the discount rate used to determine the fiscal year-end benefit obligation from the rate that was used in the preceding fiscal year.