Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 26, 2020	Sep. 28, 2019
Deferred tax assets:
Amortization and depreciation	$ 8,317	$ 11,645
Accrued liabilities and other reserves	4,934	5,196
Lease liabilities	2,038	0
Deferred revenue	1,638	1,372
Other	2,409	2,174
Total deferred tax assets	19,336	20,387
Less: Valuation allowance	(1,041)	(747)
Total deferred tax assets, net	18,295	19,640
Deferred tax liabilities:
Minimum tax on foreign earnings	7,045	10,809
Right-of-use assets	1,862	0
Unrealized gains	526	186
Other	705	600
Total deferred tax liabilities	10,138	11,595
Net deferred tax assets	$ 8,157	$ 8,045