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Fair Value Measurements (Schedule Of Available For Sale Securities) (Details) - USD ($) $ in Millions | Dec. 29, 2018 | Sep. 29, 2018
--- | --- | ---
U.S. treasury and agency |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost Basis | $ 47 | $ 48
Fair Value | 47 | 47
Unrealized Gain (Loss) | 0 | (1)
Corporate and asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost Basis | 53 | 52
Fair Value | 52 | 51
Unrealized Gain (Loss) | $ (1) | $ (1)

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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X
- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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