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		327
Common stock withheld related to net share settlement of equity awards		(845)	(449)
Share-based compensation		2,695
Net income	33,887		33,887
Dividends and dividend equivalents declared			(6,539)
Common stock repurchased			(33,609)
Other comprehensive income/(loss)	(2,636)			(2,636)
Ending balances at Mar. 31, 2018	$ 126,878	38,044	91,898	(3,064)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 1.26
Beginning balances at Dec. 30, 2017	$ 140,199	36,447	104,593	(841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		327
Common stock withheld related to net share settlement of equity awards		(107)	(56)
Share-based compensation		1,377
Net income	13,822		13,822
Dividends and dividend equivalents declared			(3,239)
Common stock repurchased			(23,500)
Other comprehensive income/(loss)	(1,945)			(1,945)
Ending balances at Mar. 31, 2018	$ 126,878	38,044	91,898	(3,064)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.63
Beginning balances at Sep. 29, 2018	$ 107,147	40,201	70,400	(3,454)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		390
Common stock withheld related to net share settlement of equity awards		(927)	(608)
Share-based compensation		3,137
Net income	31,526		31,526
Dividends and dividend equivalents declared			(7,025)
Common stock repurchased	(32,200)		(32,236)
Other comprehensive income/(loss)	1,866			1,866
Ending balances at Mar. 30, 2019	$ 105,860	42,801	64,558	(1,499)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 1.46
Beginning balances at Dec. 29, 2018	$ 117,892	40,970	80,510	(3,588)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		390
Common stock withheld related to net share settlement of equity awards		(105)	(14)
Share-based compensation		1,546
Net income	11,561		11,561
Dividends and dividend equivalents declared			(3,499)
Common stock repurchased			(24,000)
Other comprehensive income/(loss)	2,089			2,089
Ending balances at Mar. 30, 2019	$ 105,860	$ 42,801	$ 64,558	$ (1,499)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends and dividend equivalents declared per share or RSU (in dollars per share or RSU)	$ 0.73