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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions	Apr. 01, 2023	Oct. 01, 2022
Other Current Assets [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale, Current	$ 7	$ 1
Other Current 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, Current	0	0
Other Current 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, Current	7	1
Other Current 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, Current	0	0
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	97	100
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	64	65
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	33	35
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	(4)	(5)
Debt Securities, Available-for-sale	71	66
Debt Securities, Available-for-sale, Amortized Cost	75	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	33	35
Debt Securities, Available-for-sale, Amortized Cost	$ 34	$ 37

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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