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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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