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Income Taxes - Aggregate Changes in Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 28, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balances $ 16,475 $ 15,619 $ 9,694
Increases related to tax positions taken during a prior year 816 454 5,845
Decreases related to tax positions taken during a prior year (1,402) (791) (686)
Increases related to tax positions taken during the current year 1,607 1,347 1,697
Decreases related to settlements with taxing authorities (1,838) (85) (852)
Decreases related to expiration of the statute of limitations (181) (69) (79)
Ending balances $ 15,477 $ 16,475 $ 15,619