Composition of Certain Financial Statement Items Investment and Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 29, 2019	Dec. 30, 2018
Investment Income, Net [Abstract]
Interest and dividend income	$ 69	$ 74
Net gains (losses) on marketable securities	31	(72)
Net gains on other investments	48	35
Impairment losses on other investments	(72)	(9)
Net gains (losses) on derivative investments	2	(8)
Equity in net losses of investees	(10)	(21)
Net (losses) gains on foreign currency transactions	(3)	6
Investment and other income, net	$ 65	$ 5

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount of gain (loss) included in earnings for investments classified as other.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

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The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations.

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Amount of realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI).

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