Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2024	Dec. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (66)	$ (100)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	65	62
Interest costs	195	208
Expected return on plan assets	(290)	(284)
Amortization of previously deferred service costs (credits)	0	2
Recognized net actuarial loss (gain)	62	5
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(33)	(69)
Net periodic benefit cost (income)	32	(7)
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	0	0
Interest costs	11	14
Expected return on plan assets	(15)	(14)
Amortization of previously deferred service costs (credits)	(22)	(22)
Recognized net actuarial loss (gain)	(7)	(9)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(33)	(31)
Net periodic benefit cost (income)	$ (33)	$ (31)