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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Oct. 01, 2022
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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 | $ (5) | $ (5)
Debt Securities, Available-for-sale | 74 | 66
Debt Securities, Available-for-sale, Amortized Cost | 79 | 71
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 | (1) | (2)
Debt Securities, Available-for-sale | 30 | 35
Debt Securities, Available-for-sale, Amortized Cost | $ 31 | $ 37

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