Comprehensive Income - Change in AOCI by Component (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 90,488	$ 107,147	$ 134,047
Total other comprehensive income/(loss)	42	2,781	(3,026)
Ending balances	65,339	90,488	107,147
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(1,463)	(1,055)
Other comprehensive income/(loss) before reclassifications	91	(421)
Amounts reclassified from AOCI	0	0
Tax effect	(3)	13
Total other comprehensive income/(loss)	88	(408)
Ending balances	(1,375)	(1,463)	(1,055)
Cumulative Foreign Currency Translation \| Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	0	0
Ending balances		0	0
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	172	810
Other comprehensive income/(loss) before reclassifications	115	(949)
Amounts reclassified from AOCI	(1,545)	103
Tax effect	245	208
Total other comprehensive income/(loss)	(1,185)	(638)
Ending balances	(877)	172	810
Unrealized Gains/Losses on Derivative Instruments \| Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	136	0
Ending balances		136	0
Unrealized Gains/Losses on Marketable Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	707	(3,209)
Other comprehensive income/(loss) before reclassifications	1,560	4,854
Amounts reclassified from AOCI	(82)	31
Tax effect	(339)	(1,058)
Total other comprehensive income/(loss)	1,139	3,827
Ending balances	1,846	707	(3,209)
Unrealized Gains/Losses on Marketable Debt Securities \| Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	0	89
Ending balances		0	89
Accumulated other comprehensive income/(loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(584)	(3,454)	(150)
Other comprehensive income/(loss) before reclassifications	1,766	3,484
Amounts reclassified from AOCI	(1,627)	134
Tax effect	(97)	(837)
Total other comprehensive income/(loss)	42	2,781	(3,026)
Ending balances	(406)	(584)	(3,454)
Accumulated other comprehensive income/(loss) \| Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 136	89	(278)
Ending balances		$ 136	$ 89

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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