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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Deferred Taxes [Line Items]      
Effective income tax rate reconciliation, percent 12.00% 7.00% (42.00%)
Valuation allowance, deferred tax asset, increase (decrease), amount   $ 48 $ 121
Restructuring and impairment costs $ 546 510 1,049
Restructuring charges, benefit 80 26 $ 120
Income taxes receivable, current 562 100  
Taxes payable, current 176 211  
Undistributed earnings of foreign subsidiaries 22,700    
Operating loss carryforwards 26,100    
Net operating loss carry forwards that will expire 15,700    
Tax credit carryforward, amount $ 35    
Switzerland      
Deferred Taxes [Line Items]      
Impact on deferred tax assets   $ 80