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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($)
$ in Millions
 6 Months Ended
Mar. 30, 2024
Sep. 30, 2023
Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available For Sale Securities Debt Maturity Period 46 years  
Short Term Investment Maturity Period 12 months  
Other Current Assets [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Current $ 16 $ 15
Other Current Assets [Member] | Level 1 | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Current 0 0
Other Current Assets [Member] | Level 2 | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Current 16 15
Other Current Assets [Member] | Level 3 | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Current 0 0
Other Assets [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Noncurrent 92 89
Other Assets [Member] | Level 1 | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Noncurrent 0 0
Other Assets [Member] | Level 2 | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Noncurrent 62 59
Other Assets [Member] | Level 3 | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-Sale, Noncurrent 30 30
U.S. treasury and agency    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax (4) (5)
Debt Securities, Available-for-sale 78 74
Debt Securities, Available-for-sale, Amortized Cost 82 79
Corporate and asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax 0 (1)
Debt Securities, Available-for-sale 30 30
Debt Securities, Available-for-sale, Amortized Cost $ 30 $ 31