Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Schedule of Income Before Taxes by Fiscal Year

The Company’s income before income taxes by fiscal year consisted of the following:

	For the Years Ended September 30,
	2025		2024		2023
	(in millions)
U.S.	$	14,776	$	14,537	$	13,339
Non-U.S.	9,418		9,379		7,698
Total income before income taxes	$	24,194	$	23,916	$	21,037

Schedule of Income Tax Expense by Fiscal Year

Income tax provision by fiscal year consisted of the following:

	For the Years Ended September 30,
	2025		2024		2023
	(in millions)
Current:
U.S. federal	$	1,879	$	2,694	$	2,630
State and local	251		298		293
Non-U.S.	1,854		1,281		1,324
Total current taxes	3,984		4,273		4,247
Deferred:
U.S. federal	102		(132)		(339)
State and local	9		(18)		(1)
Non-U.S.	41		50		(143)
Total deferred taxes	152		(100)		(483)
Total income tax provision	$	4,136	$	4,173	$	3,764

Schedule of Components of Deferred Tax Assets and Liabilities

The following table presents the components of deferred tax assets and liabilities:

	September 30,
	2025		2024
	(in millions)
Deferred tax assets:
Accrued compensation and benefits	$	250	$	221
Accrued litigation	690		374
Client incentives	288		855
Net operating loss carryforwards	258		206
Comprehensive loss	206		79
Federal benefit of state taxes	74		16
Other	26		102
Valuation allowance	(264)		(212)
Total deferred tax assets	1,528		1,641
Deferred tax liabilities:
Property, equipment and technology, net	(296)		(295)
Intangible assets	(6,532)		(6,404)
Unrealized gains on equity securities	(71)		(81)
Foreign taxes	(50)		(22)
Total deferred tax liabilities	(6,949)		(6,802)
Net deferred tax liabilities	$	(5,421)	$	(5,161)

Schedule of Reconciliation of the US Statutory Federal Tax Rate

The following table presents a reconciliation of the income tax provision to the amount of income tax determined by applying the U.S. federal statutory income tax rate to income before income taxes:

	For the Years Ended September 30,
	2025				2024				2023
	(in millions, except percentages)
U.S. federal income tax at statutory rate	$	5,081	21	%	$	5,022	21	%	$	4,418	21	%
State income taxes, net of federal benefit	244		1	%	258		1	%	245		1	%
Non-U.S. tax effect, net of federal benefit	(775)		(3	%)	(828)		(4	%)	(758)		(3	%)
Reassessment of an uncertain tax position	—		—	%	—		—	%	(142)		(1	%)
Conclusion of audits	—		—	%	(223)		(1	%)	—		—	%
Tax position taken on certain expenses	(263)		(1	%)	—		—	%	—		—	%
Other, net	(151)		(1	%)	(56)		—	%	1		—	%
Income tax provision	$	4,136	17	%	$	4,173	17	%	$	3,764	18	%

Schedule of Reconciliation of Beginning and Ending Unrecognized Tax Benefits by Fiscal Year

The following table presents a reconciliation of beginning and ending unrecognized tax benefits by fiscal year: 

	2025		2024		2023
	(in millions)
Balance as of beginning of period	$	3,750	$	3,497	$	2,683
Increase related to prior years	281		148		515
Decrease related to prior years	(2,455)		(322)		(190)
Increase related to current year	150		556		510
Decrease related to settlements with taxing authorities	(49)		(127)		(17)
Decrease related to lapsing statute of limitations	(5)		(2)		(4)
Balance as of end of period	$	1,672	$	3,750	$	3,497