Pension and Other Benefit Programs - Accumulated Other Comprehensive Loss, Before Tax, not yet Recognized in Net Periodic Benefit Cost (Detail) $ in Millions	Sep. 27, 2025 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Prior Service Cost (Benefit)	$ (362)
Net actuarial loss (gain)	2,327
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	1,965
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Prior Service Cost (Benefit)	14
Net actuarial loss (gain)	2,494
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	2,508
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Prior Service Cost (Benefit)	(376)
Net actuarial loss (gain)	(167)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	$ (543)