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Fair Value Measurements (Schedule Of Debt Securities Measured At Fair Value On A Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of year $ 28 $ 30
Total unrealized gains (losses) included in other comprehensive income (loss) 0 1
Purchases 9 5
Settlements (10) (8)
Balance at end of period $ 27 $ 28