CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income/(loss)
Beginning balances at Sep. 30, 2017	$ 134,047	$ 35,867	$ 98,330	$ (150)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		328
Common stock withheld related to net share settlement of equity awards		(1,642)	(807)
Share-based compensation		4,071
Net income	45,406		45,406
Dividends and dividend equivalents declared			(10,162)
Common stock repurchased			(53,609)
Other comprehensive income/(loss)	(2,683)			(2,683)
Ending balances at Jun. 30, 2018	$ 114,949	38,624	79,436	(3,111)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 1.99
Beginning balances at Mar. 31, 2018	$ 126,878	38,044	91,898	(3,064)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		1
Common stock withheld related to net share settlement of equity awards		(797)	(358)
Share-based compensation		1,376
Net income	11,519		11,519
Dividends and dividend equivalents declared			(3,623)
Common stock repurchased			(20,000)
Other comprehensive income/(loss)	(47)			(47)
Ending balances at Jun. 30, 2018	$ 114,949	38,624	79,436	(3,111)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.73
Beginning balances at Sep. 29, 2018	$ 107,147	40,201	70,400	(3,454)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		391
Common stock withheld related to net share settlement of equity awards		(1,885)	(944)
Share-based compensation		4,664
Net income	41,570		41,570
Dividends and dividend equivalents declared			(10,605)
Common stock repurchased	(49,200)		(49,198)
Other comprehensive income/(loss)	2,726			2,726
Ending balances at Jun. 29, 2019	$ 96,456	43,371	53,724	(639)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 2.23
Beginning balances at Mar. 30, 2019	$ 105,860	42,801	64,558	(1,499)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		1
Common stock withheld related to net share settlement of equity awards		(958)	(336)
Share-based compensation		1,527
Net income	10,044		10,044
Dividends and dividend equivalents declared			(3,580)
Common stock repurchased			(16,962)
Other comprehensive income/(loss)	860			860
Ending balances at Jun. 29, 2019	$ 96,456	$ 43,371	$ 53,724	$ (639)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.77