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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Components of Income Tax [Line Items]      
Effective income tax rate reconciliation, percent (1.00%) 33.00% 12.00%
Valuation allowance, deferred tax asset, increase (decrease), amount $ 27   $ 26
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations 301    
Unrecognized tax benefit resulting from tax audit resolution     44
Restructuring and impairment costs 721 $ 242 783
Restructuring charges, benefit 50 39 48
Intercompany intellectual property transfer 0 417 0
Effective income tax rate reconciliation, other adjustments, amount     $ 30
Income taxes receivable, current 253 120  
Taxes payable, current 143 201  
Undistributed earnings of foreign subsidiaries 23,600    
Operating loss carryforwards 24,300    
Net operating loss carry forwards that will expire 14,000    
Tax credit carryforward, amount $ 35    
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]      
Ireland statutory rate 12.50%