Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 02, 2022	Apr. 03, 2021	Apr. 02, 2022	Apr. 03, 2021
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (16)	$ 36	$ (32)	$ 68
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	102	109	202	217
Interest costs	126	115	250	229
Expected return on plan assets	(294)	(274)	(587)	(549)
Amortization of previously deferred service costs	1	4	2	6
Recognized net actuarial loss	145	185	292	371
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(22)	30	(43)	57
Net periodic benefit cost	80	139	159	274
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	3	2	5	5
Interest costs	13	11	26	23
Expected return on plan assets	(14)	(13)	(29)	(27)
Amortization of previously deferred service costs	0	0	0	0
Recognized net actuarial loss	7	8	14	15
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	6	6	11	11
Net periodic benefit cost	$ 9	$ 8	$ 16	$ 16