Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions	6 Months Ended
Mar. 28, 2026	Sep. 27, 2025
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available For Sale Securities Debt Maturity Period	43 years
Short Term Investment Maturity Period	12 months
Other Assets [Member] \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale, Noncurrent	$ 118	$ 117
Other Assets [Member] \| Level 1 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale, Noncurrent	0	0
Other Assets [Member] \| Level 2 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale, Noncurrent	88	90
Other Assets [Member] \| Level 3 \| Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale, Noncurrent	30	27
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	(2)	(1)
Debt Securities, Available-for-sale	88	90
Debt Securities, Available-for-Sale, Amortized Cost, Total	90	91
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	30	27
Debt Securities, Available-for-Sale, Amortized Cost, Total	$ 30	$ 27

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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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

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Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on 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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