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Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 03, 2021
Jun. 27, 2020
Jul. 03, 2021
Jun. 27, 2020
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ 32 $ (3) $ 100 $ (8)
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service costs 108 102 325 307
Interest costs 114 133 343 399
Expected return on plan assets (275) (273) (824) (819)
Amortization of previously deferred service costs 2 3 8 10
Recognized net actuarial loss 186 131 557 393
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 27 (6) 84 (17)
Net periodic benefit cost 135 96 409 290
Postretirement Medical Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service costs 3 3 8 8
Interest costs 12 14 35 42
Expected return on plan assets (14) (14) (41) (43)
Amortization of previously deferred service costs 0 0 0 0
Recognized net actuarial loss 7 3 22 10
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component 5 3 16 9
Net periodic benefit cost $ 8 $ 6 $ 24 $ 17