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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 01, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Income Tax Examination [Line Items]        
Effective income tax rate   0.20% 8.20%  
Gross tax effected unrecognized tax benefits       $ 2,200
Amount of unrecognized tax benefits which may impact effective tax rate       1,600
Total net accrued interest, net of tax benefit       $ 335
Unrecognized tax benefits, income tax penalties and interest expense   $ 31 $ 26  
Restructuring and impairment costs   39 345  
Restructuring charges, tax benefit   $ 7 $ 52  
IRELAND        
Income Tax Examination [Line Items]        
Ireland statutory income tax rate   12.50% 12.50%  
SWITZERLAND        
Income Tax Examination [Line Items]        
Noncash discrete net tax benefit   $ 80    
SWITZERLAND | Subsequent Event        
Income Tax Examination [Line Items]        
Ireland statutory income tax rate 15.00%