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Pensions And Other Postretirement Benefits (Reconciliation Of Changes In Plans' Benefit Obligations, Assets And Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 30, 2023
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 14 $ 14 $ 13
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 31 34 50
Defined Benefit Plan, Plan Assets, Amount 0 0 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total (31) (34)  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 3 3  
Defined Benefit Plan, Service Cost 2 2 2
Defined Benefit Plan, Interest Cost 1 1 1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 (16)  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (3) 0  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (3) (3)  
Defined Benefit Plan, Plan Assets, Benefits Paid (3) (3)  
Defined Benefit Plan, Funded Plan | Qualified Plan | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 20 21 18
Defined Benefit Plan, Plan Assets, Amount 30 30 27
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total 10 9  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 1 4  
Defined Benefit Plan, Plan Assets, Contributions by Employer 0 0  
Defined Benefit Plan, Service Cost 0 0 0
Defined Benefit Plan, Interest Cost 1 1 1
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (1) 3  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (1) (1)  
Defined Benefit Plan, Plan Assets, Benefits Paid (1) (1)  
Defined Benefit Plan, Unfunded Plan | Nonqualified Plan | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 156 167 158
Defined Benefit Plan, Plan Assets, Amount 0 0 0
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total (156) (167)  
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0 0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 14 14  
Defined Benefit Plan, Service Cost 0 0 0
Defined Benefit Plan, Interest Cost 7 9 $ 8
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0  
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (4) 14  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (14) (14)  
Defined Benefit Plan, Plan Assets, Benefits Paid $ (14) $ (14)