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 |