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Income Taxes - Reconciliation of the Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Income Tax Disclosure [Abstract]      
Computed expected tax $ 22,933 $ 14,089 $ 13,805
State taxes, net of federal effect 1,151 423 423
Impacts of the U.S. Tax Cuts and Jobs Act of 2017 0 (582) 0
Earnings of foreign subsidiaries (4,715) (2,534) (2,625)
Foreign-derived intangible income deduction (1,372) (169) (149)
Research and development credit, net (1,033) (728) (548)
Excess tax benefits from equity awards (2,137) (930) (639)
Other (300) 111 214
Provision for income taxes $ 14,527 $ 9,680 $ 10,481
Effective tax rate 13.30% 14.40% 15.90%