Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Jan. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (86)	$ (16)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	65	100
Interest costs	196	124
Expected return on plan assets	(288)	(293)
Amortization of previously deferred service costs	2	1
Recognized net actuarial loss	5	147
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(85)	(21)
Net periodic benefit cost (income)	(20)	79
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	1	2
Interest costs	20	13
Expected return on plan assets	(15)	(15)
Amortization of previously deferred service costs	0	0
Recognized net actuarial loss	(6)	7
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	(1)	5
Net periodic benefit cost (income)	$ 0	$ 7