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Pension Benefit Obligations -Schedule of Fair Values of the Defined Benefit Pension Plan and the Postretirement Plan Assets by Major Asset Categories (Details) - USD ($)
$ in Millions
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Oct. 01, 2021
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year $ 315 $ 281 $ 271 $ 366
Quoted Prices in Active Markets (Level 1)        
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year 134 218    
Investments measured at NAV        
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year 181 63    
Cash and cash equivalents | Quoted Prices in Active Markets (Level 1)        
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year 6 9    
Diversified and equity funds | Quoted Prices in Active Markets (Level 1)        
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year 0 147    
Diversified and equity funds | Investments measured at NAV        
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year 94 0    
Fixed income funds | Quoted Prices in Active Markets (Level 1)        
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year 128 62    
Common collective funds - debt | Investments measured at NAV        
Defined Benefit Plan, Plan Assets, Category [Line Items]        
Fair value of plan assets at end of year $ 87 $ 63