v3.26.1
Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (113) $ (67) $ (344) $ (198)
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service costs 60 65 183 196
Interest costs 199 195 598 587
Expected return on plan assets (306) (290) (918) (871)
Amortization of previously deferred service costs (credits) 1 0 4 2
Recognized net actuarial loss (gain) 24 62 72 185
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (82) (33) (244) (97)
Net periodic benefit cost (income) (22) 32 (61) 99
Postretirement Medical Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service costs 0 0 0 0
Interest costs 12 11 34 33
Expected return on plan assets (15) (15) (47) (45)
Amortization of previously deferred service costs (credits) (22) (22) (67) (67)
Recognized net actuarial loss (gain) (6) (8) (20) (22)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (31) (34) (100) (101)
Net periodic benefit cost (income) $ (31) $ (34) $ (100) $ (101)