CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) shares in Millions, $ in Millions		Total	Series A preferred stock	Preferred Stock		Preferred Stock Series A preferred stock	Common Stock and Additional Paid-in Capital		Right to Recover for Covered Losses	Accumulated Income	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Sep. 30, 2022				5
Balance as of beginning of period at Sep. 30, 2022		$ 35,581		$ 2,324	[1]		$ 19,545		$ (35)	$ 16,116	$ (2,369)
Beginning Balance (in shares) at Sep. 30, 2022							1,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		17,273								17,273
Other comprehensive income (loss)		1,052									1,052
VE territory covered losses		(136)							(136)
Recovery through conversion rate adjustments		1		$ (30)					31
Conversions to class A common stock (in shares)				0	[2]		10
Conversions to class A common stock		0		$ (596)			$ 596
Share-based compensation		765					$ 765
Stock issued under equity plans (in shares)							5
Stock issued under equity plans		260					$ 260
Shares withheld for taxes related to stock issued under equity plans (in shares)							(1)
Shares withheld for taxes related to stock issued under equity plans		(130)					$ (130)
Cash dividends declared and paid, at a quarterly amount per class A common stock		(3,751)								(3,751)
Repurchases of class A common stock (in shares)							(55)
Repurchases of class A common stock		(12,182)					$ (584)			(11,598)
Ending Balance (in shares) at Sep. 30, 2023				5
Balance as of end of period at Sep. 30, 2023		38,733		$ 1,698	[1],[3]		$ 20,452		(140)	18,040	(1,317)
Ending Balance (in shares) at Sep. 30, 2023							1,849
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		19,743								19,743
Other comprehensive income (loss)		1,009									1,009
VE territory covered losses		(139)							(139)
Recovery through conversion rate adjustments		(6)		$ (181)					175
Anniversary release (in shares)	[4],[5]					0
Anniversary release	[4]		$ (5)			$ (5)
Conversions to class A common stock (in shares)				0	[5]		151
Conversions to class A common stock		0		$ (481)			$ 481
Class B-1 common stock exchange offer (in shares)							(73)
Class B-1 common stock exchange offer		0					$ 0	[5]
Share-based compensation		850					$ 850
Stock issued under equity plans (in shares)							6
Stock issued under equity plans		335					$ 335
Shares withheld for taxes related to stock issued under equity plans (in shares)							(1)
Shares withheld for taxes related to stock issued under equity plans		(208)					$ (208)
Cash dividends declared and paid, at a quarterly amount per class A common stock		(4,217)								(4,217)
Repurchases of class A common stock (in shares)							(64)
Repurchases of class A common stock		$ (16,958)					$ (681)			(16,277)
Ending Balance (in shares) at Sep. 30, 2024		5	0	5
Balance as of end of period at Sep. 30, 2024		$ 39,137		$ 1,031	[3],[6]		$ 21,229		(104)	17,289	(308)
Ending Balance (in shares) at Sep. 30, 2024							1,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		20,058								20,058
Other comprehensive income (loss)		556									556
VE territory covered losses		(28)							(28)
Recovery through conversion rate adjustments		0		$ (8)					8
Anniversary release (in shares)	[7],[8]					0
Anniversary release	[8]		$ (7)			$ (7)
Conversions to class A common stock (in shares)				0	[7]		7
Conversions to class A common stock		0		$ (271)			$ 271
Share-based compensation		897					$ 897
Stock issued under equity plans (in shares)							5
Stock issued under equity plans		396					$ 396
Shares withheld for taxes related to stock issued under equity plans (in shares)							(1)
Shares withheld for taxes related to stock issued under equity plans		(281)					$ (281)
Cash dividends declared and paid, at a quarterly amount per class A common stock		(4,634)								(4,634)
Repurchases of class A common stock (in shares)							(54)
Repurchases of class A common stock		$ (18,185)					$ (578)			(17,607)
Ending Balance (in shares) at Sep. 30, 2025		5	0	5
Balance as of end of period at Sep. 30, 2025		$ 37,909		$ 745	[6]		$ 21,934		$ (124)	$ 15,106	$ 248
Ending Balance (in shares) at Sep. 30, 2025							1,825

[1] As of September 30, 2023 and 2022, the book value of series A preferred stock was $456 million and $1.0 billion, respectively. See Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and C preferred stock.

[2] Increase or decrease is less than one million

[3] As of September 30, 2024 and 2023, the book value of series A preferred stock was $540 million and $456 million, respectively. See Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B and C preferred stock.

[4] See Note 5—U.S. and Europe Retrospective Responsibility Plans for further details.

[5] Increase or decrease is less than one million

[6] As of September 30, 2025 and 2024, the book value of series A convertible participating preferred stock (series A preferred stock) was $513 million and $540 million, respectively. See Note 5—U.S. and Europe Retrospective Responsibility Plans for the book value of series B convertible participating preferred stock (series B preferred stock) and series C convertible participating preferred stock (series C preferred stock).

[7] Increase or decrease is less than one million.

[8] See Note 5—U.S. and Europe Retrospective Responsibility Plans for further details.