Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016
Deferred tax assets:
Accrued liabilities and other reserves	$ 4,019	$ 4,135
Basis of capital assets	1,230	2,107
Deferred revenue	1,521	1,717
Deferred cost sharing	667	667
Share-based compensation	703	601
Other	834	788
Total deferred tax assets, net of valuation allowance of $0	8,974	10,015
Deferred tax liabilities:
Unremitted earnings of foreign subsidiaries	36,355	31,436
Other	207	485
Total deferred tax liabilities	36,562	31,921
Net deferred tax liabilities	(27,588)	(21,906)
Deferred tax assets, valuation allowance	$ 0	$ 0