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Income Taxes - Information that Causes the Income Tax Expense to Differ from the Amount of Income Tax Determined by Applying the Applicable U.S. Federal Statutory Rate of 35% to Pretax Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
U.S. federal income tax at statutory rate	$ 4,418	$ 3,809	$ 3,373
State income taxes, net of federal benefit	245	216	222
Non-U.S. tax effect, net of federal benefit	(758)	(588)	(505)
Remeasurement of deferred tax balances	0	0	1,007
Reassessment of an uncertain tax position	(142)	0	0
Conclusion of audits	0	0	(255)
State tax apportionment position	0	(176)	0
Other, net	1	(82)	(90)
Total income tax provision	$ 3,764	$ 3,179	$ 3,752
U.S. federal income tax at statutory rate, percent	21.00%	21.00%	21.00%
State income taxes, net of federal benefit, percent	1.00%	1.00%	1.00%
Non-U.S. tax effect, net of federal benefit, percent	(3.00%)	(3.00%)	(3.00%)
Remeasurement of deferred tax liability, percent	0.00%	0.00%	6.00%
Reassessment of an uncertain tax position, percent	(1.00%)	0.00%	0.00%
Conclusion of audits, percent	0.00%	0.00%	(2.00%)
State tax apportionment position, percent	0.00%	(1.00%)	0.00%
Other, net, percent	0.00%	0.00%	0.00%
Income tax provision, percent	18.00%	18.00%	23.00%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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