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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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