Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (87)	$ (13)	$ (257)	$ (45)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	65	100	193	302
Interest costs	195	124	586	374
Expected return on plan assets	(288)	(293)	(863)	(880)
Amortization of previously deferred service costs	2	3	7	5
Recognized net actuarial loss	5	149	14	441
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(86)	(17)	(256)	(60)
Net periodic benefit cost (income)	(21)	83	(63)	242
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	1	2	4	7
Interest costs	20	13	61	39
Expected return on plan assets	(15)	(15)	(45)	(44)
Amortization of previously deferred service costs	0	0	0	0
Recognized net actuarial loss	(6)	6	(17)	20
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(1)	4	(1)	15
Net periodic benefit cost (income)	$ 0	$ 6	$ 3	$ 22