Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount of asset hedged in fair value hedging relationship.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.

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Amount of liability hedged in fair value hedging relationship.

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Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

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Financial Instruments - Derivative Instruments Designated as Fair Value Hedges and Related Hedged Items (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Sep. 26, 2020
Foreign exchange contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Cumulative hedging adjustment increases/(decreases) included in the carrying amount of hedged marketable securities	$ 956		$ 493
Interest rate contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Cumulative hedging adjustment (increases)/decreases included in the carrying amount of hedged fixed-rate debt	(1,374)		(1,541)
Current marketable securities and non-current marketable securities \| Foreign exchange contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Carrying amount of hedged marketable securities	17,009		16,270
Current term debt and non-current term debt \| Interest rate contracts
Carrying amounts of hedged assets/(liabilities) and cumulative hedging adjustments:
Carrying amount of hedged fixed-rate debt	(20,866)		$ (21,033)
OI&E
Gains/(Losses) related to derivative instruments and hedged items:
Gains/(Losses) on derivative instruments	(920)	$ (345)
Gains/(Losses) related to hedged items	919	345
OI&E \| Foreign exchange contracts
Gains/(Losses) related to derivative instruments and hedged items:
Gains/(Losses) on derivative instruments	(753)	(183)
Gains/(Losses) related to hedged items	752	183
OI&E \| Interest rate contracts
Gains/(Losses) related to derivative instruments and hedged items:
Gains/(Losses) on derivative instruments	(167)	(162)
Gains/(Losses) related to hedged items	$ 167	$ 162