Comprehensive Income - Change in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 26, 2020	Dec. 28, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 65,339	$ 90,488
Total other comprehensive income/(loss)	585	30
Ending balances	66,224	89,531
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(1,375)
Other comprehensive income/(loss) before reclassifications	549
Amounts reclassified from AOCI	0
Tax effect	0
Total other comprehensive income/(loss)	549
Ending balances	(826)
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(877)
Other comprehensive income/(loss) before reclassifications	(294)
Amounts reclassified from AOCI	(276)
Tax effect	83
Total other comprehensive income/(loss)	(487)
Ending balances	(1,364)
Unrealized Gains/Losses on Marketable Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	1,846
Other comprehensive income/(loss) before reclassifications	708
Amounts reclassified from AOCI	(118)
Tax effect	(67)
Total other comprehensive income/(loss)	523
Ending balances	2,369
Accumulated other comprehensive income/(loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(406)	(584)
Other comprehensive income/(loss) before reclassifications	963
Amounts reclassified from AOCI	(394)
Tax effect	16
Total other comprehensive income/(loss)	585	30
Ending balances	$ 179	$ (418)

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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