CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 57,411	$ 55,256	$ 59,531
Other comprehensive income/(loss):
Change in foreign currency translation, net of tax	88	(408)	(525)
Change in unrealized gains/losses on derivative instruments, net of tax:
Change in fair value of derivatives	79
Change in fair value of derivatives		(661)	523
Adjustment for net (gains)/losses realized and included in net income	(1,264)
Adjustment for net (gains)/losses realized and included in net income		23	382
Total change in unrealized gains/losses on derivative instruments	(1,185)
Total change in unrealized gains/losses on derivative instruments		(638)	905
Change in unrealized gains/losses on marketable debt securities, net of tax:
Change in fair value of marketable debt securities	1,202	3,802	(3,407)
Adjustment for net (gains)/losses realized and included in net income	(63)	25	1
Total change in unrealized gains/losses on marketable debt securities	1,139	3,827	(3,406)
Total other comprehensive income/(loss)	42	2,781	(3,026)
Total comprehensive income	$ 57,453	$ 58,037	$ 56,505