Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (99)	$ (87)	$ (302)	$ (257)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	62	65	187	193
Interest costs	209	195	626	586
Expected return on plan assets	(284)	(288)	(853)	(863)
Amortization of previously deferred service costs	2	2	6	7
Recognized net actuarial loss	5	5	15	14
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(68)	(86)	(206)	(256)
Net periodic benefit cost (income)	(6)	(21)	(19)	(63)
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	1	1	1	4
Interest costs	14	20	41	61
Expected return on plan assets	(14)	(15)	(43)	(45)
Amortization of previously deferred service costs	(22)	0	(67)	0
Recognized net actuarial loss	(9)	(6)	(27)	(17)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(31)	(1)	(96)	(1)
Net periodic benefit cost (income)	$ (30)	$ 0	$ (95)	$ 3