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Pension and Other Postretirement Benefit Plans (Narrative) (Details)
$ in Millions
 12 Months Ended
Sep. 27, 2025
USD ($)
plan
Sep. 28, 2024
USD ($)
plan
Sep. 30, 2023
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Contribution Plan, Cost $ 114 $ 111 $ 113
Defined Benefit Plan, Funding Status [Extensible Enumeration] Defined Benefit Plan, Unfunded Plan    
Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 4    
Multiemployer Plan, Employer Contribution, Cost $ 1 2  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 15    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 14 $ 14 13
Defined Benefit Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Number of Plans | plan 3 3  
Pension Plan [Member] | Nonqualified Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 3    
Pension Plan [Member] | Defined Benefit Plan, Funded Plan | Qualified Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Frozen and Noncontributory Plans | plan 1    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 0 $ 0  
Defined Benefit Plan, Benefit Obligation 20 21 18
Defined Benefit Plan, Expected Amortization, Next Fiscal Year 0    
Defined Benefit Plan, Accumulated Benefit Obligation 20 21  
Assets for Plan Benefits, Defined Benefit Plan 10 9  
Defined Benefit Plan, Plan Assets, Amount 30 30 27
Pension Plan [Member] | Defined Benefit Plan, Unfunded Plan | Nonqualified Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Plan Assets, Contributions by Employer 14 14  
Defined Benefit Plan, Benefit Obligation 156 167 158
Assets for Plan Benefits, Defined Benefit Plan 0 0  
Defined Benefit Plan, Plan Assets, Amount $ 0 0 0
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 8    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 3 3  
Defined Benefit Plan, Benefit Obligation 31 34 50
Defined Benefit Plan, Gain from Plan Amendment   16  
Assets for Plan Benefits, Defined Benefit Plan 0 0  
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 0 $ 0
Other Postretirement Benefits Plan [Member] | Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 2    
Defined Benefit Plan, Benefit Obligation $ 7    
Postretirement Health Coverage      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 5    
Postretirement Health Coverage | Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 1    
Postretirement Health Coverage | Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Keystone Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 8.90%    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 4.50%    
Postretirement Health Coverage | Other Postretirement Benefit Plan, Heathcare Cost Trend Rates, Keystone Plan | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 3    
Postretirement Health Coverage | Other Postretirement Benefit Plan, Plan Amendments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 2    
Postretirement Health Coverage | Other Postretirement Benefit Plan, Plan Amendments | Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 1    
Postretirement Life Insurance | Other Postretirement Benefit Plans, Fixed Annual Payments or Life Insurance      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Number of Plans | plan 1