Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 25, 2021	Sep. 26, 2020
Deferred tax assets:
Amortization and depreciation	$ 5,575	$ 8,317
Accrued liabilities and other reserves	5,895	4,934
Lease liabilities	2,406	2,038
Deferred revenue	5,399	1,638
Tax credit carryforwards	4,262	797
Other	1,639	1,612
Total deferred tax assets	25,176	19,336
Less: Valuation allowance	(4,903)	(1,041)
Total deferred tax assets, net	20,273	18,295
Deferred tax liabilities:
Minimum tax on foreign earnings	4,318	7,045
Right-of-use assets	2,167	1,862
Unrealized gains	203	526
Other	512	705
Total deferred tax liabilities	7,200	10,138
Net deferred tax assets	$ 13,073	$ 8,157