Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (13)	$ 32	$ (45)	$ 100
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	100	108	302	325
Interest costs	124	114	374	343
Expected return on plan assets	(293)	(275)	(880)	(824)
Amortization of previously deferred service costs	3	2	5	8
Recognized net actuarial loss	149	186	441	557
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(17)	27	(60)	84
Net periodic benefit cost	83	135	242	409
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	2	3	7	8
Interest costs	13	12	39	35
Expected return on plan assets	(15)	(14)	(44)	(41)
Amortization of previously deferred service costs	0	0	0	0
Recognized net actuarial loss	6	7	20	22
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	4	5	15	16
Net periodic benefit cost	$ 6	$ 8	$ 22	$ 24