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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 30, 2024 | Sep. 30, 2023
Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available For Sale Securities Debt Maturity Period | 46 years |
Short Term Investment Maturity Period | 12 months |
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 | $ 16 | $ 15
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 | 16 | 15
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 | 92 | 89
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 | 62 | 59
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 | 30
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 | 78 | 74
Debt Securities, Available-for-sale, Amortized Cost | 82 | 79
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 | (1)
Debt Securities, Available-for-sale | 30 | 30
Debt Securities, Available-for-sale, Amortized Cost | $ 30 | $ 31

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