v3.26.1
Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 28, 2026
Mar. 29, 2025
Mar. 28, 2026
Mar. 29, 2025
Defined Benefit Plan Disclosure [Line Items]        
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component $ (115) $ (65) $ (231) $ (131)
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service costs 62 66 123 131
Interest costs 200 197 399 392
Expected return on plan assets (306) (291) (612) (581)
Amortization of previously deferred service costs (credits) 2 2 3 2
Recognized net actuarial loss (gain) 24 61 48 123
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (80) (31) (162) (64)
Net periodic benefit cost (income) (18) 35 (39) 67
Postretirement Medical Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service costs 0 0 0 0
Interest costs 11 11 22 22
Expected return on plan assets (16) (15) (32) (30)
Amortization of previously deferred service costs (credits) (23) (23) (45) (45)
Recognized net actuarial loss (gain) (7) (7) (14) (14)
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component (35) (34) (69) (67)
Net periodic benefit cost (income) $ (35) $ (34) $ (69) $ (67)