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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Components of Income Tax [Line Items]        
Effective income tax rate reconciliation, percent   7.00% (42.00%) (16.00%)
Valuation allowance, deferred tax asset, increase (decrease), amount   $ 48 $ 121  
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations   91 438 $ 301
Restructuring and impairment costs   510 1,049 701
Restructuring charges, benefit   26 120 $ 47
Income taxes receivable, current   100 65  
Taxes payable, current   211 $ 249  
Undistributed earnings of foreign subsidiaries   24,500    
Operating loss carryforwards   22,100    
Net operating loss carry forwards that will expire   11,800    
Tax credit carryforward, amount   35    
Switzerland        
Components of Income Tax [Line Items]        
Impact on deferred tax assets (less than)   $ (80)    
Statutory rate 15.00%