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Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (100) $ (86)
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service costs 62 65
Interest costs 208 196
Expected return on plan assets (284) (288)
Amortization of previously deferred service costs 2 2
Recognized net actuarial loss 5 5
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (69) (85)
Net periodic benefit cost (income) (7) (20)
Postretirement Medical Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service costs 0 1
Interest costs 14 20
Expected return on plan assets (14) (15)
Amortization of previously deferred service costs (22) 0
Recognized net actuarial loss (9) (6)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (31) (1)
Net periodic benefit cost (income) $ (31) $ 0