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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions | Apr. 02, 2022 | Oct. 02, 2021
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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 | $ (3) | $ 0
Debt Securities, Available-for-sale | 59 | 61
Debt Securities, Available-for-sale, Amortized Cost | 62 | 61
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) | 1
Debt Securities, Available-for-sale | 46 | 48
Debt Securities, Available-for-sale, Amortized Cost | $ 47 | $ 47

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