Pension and Other Benefit Programs - Accumulated Other Comprehensive Loss, Before Tax, not yet Recognized in Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	Oct. 01, 2022	Oct. 02, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	$ 26
Net actuarial loss	3,745
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	3,771
Prepaid Accrued Pension Costs	(2,674)
Net balance sheet liability	1,097
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	26
Net actuarial loss	3,838
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	3,864
Prepaid Accrued Pension Costs	(3,557)
Net balance sheet liability	307	$ 2,879
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	0
Net actuarial loss	(93)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	(93)
Prepaid Accrued Pension Costs	883
Net balance sheet liability	$ 790	$ 1,232