Income Taxes - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 11, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Components of Income Tax [Line Items]
Effective income tax rate reconciliation, percent			(19.00%)	(1.00%)	33.00%
Valuation allowance, deferred tax asset, increase (decrease), amount			$ 121	$ 27
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations			438	301
Restructuring and impairment costs			1,064	721	$ 242
Restructuring charges, benefit			122	50	39
Intellectual property transactions and adjustments			(176)	0	417
Income taxes receivable, current			65	253
Taxes payable, current			249	$ 143
Undistributed earnings of foreign subsidiaries			24,400
Operating loss carryforwards			24,400
Net operating loss carry forwards that will expire			14,100
Tax credit carryforward, amount			$ 35
Forecast
Components of Income Tax [Line Items]
Impact on deferred tax assets (less than)		$ 100
CANADA
Components of Income Tax [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount					(39)
Mexico
Components of Income Tax [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount					$ (105)
IRELAND
Components of Income Tax [Line Items]
Statutory rate			12.50%	12.50%	12.50%
Switzerland
Components of Income Tax [Line Items]
Statutory rate	15.00%