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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions | Sep. 27, 2025 | Sep. 28, 2024
--- | --- | ---
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 | $ (1) | $ (1)
Debt Securities, Available-for-sale | 90 | 85
Debt Securities, Available-for-Sale, Amortized Cost, Total | 91 | 86
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 | 0
Debt Securities, Available-for-sale | 27 | 28
Debt Securities, Available-for-Sale, Amortized Cost, Total | $ 27 | $ 28

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