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Debt - Extinguishments of Debt (Details)
€ in Millions, £ in Millions, $ in Millions
Sep. 30, 2025
EUR (€)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
GBP (£)
Sep. 30, 2024
USD ($)
0.034% Notes due August 13, 2025        
Extinguishment of Debt [Line Items]        
Interest rate (percent) 0.034% 0.034% 0.034%  
0.034% Notes due August 13, 2025 | Euro Member Countries, Euro        
Extinguishment of Debt [Line Items]        
Debt instrument, repurchased face amount | € € 500      
0.034% Notes due August 13, 2025 | United States of America, Dollars        
Extinguishment of Debt [Line Items]        
Debt instrument, repurchased face amount   $ 584    
3.020% Notes due May 24, 2025        
Extinguishment of Debt [Line Items]        
Interest rate (percent) 3.02% 3.02% 3.02%  
3.020% Notes due May 24, 2025 | United States of America, Dollars        
Extinguishment of Debt [Line Items]        
Debt instrument, repurchased face amount   $ 339    
3.020% Notes due May 24, 2025 | United Kingdom, Pounds        
Extinguishment of Debt [Line Items]        
Debt instrument, repurchased face amount | £     £ 250  
3.734% Notes due December 15, 2024        
Extinguishment of Debt [Line Items]        
Debt instrument, repurchased face amount   $ 875    
Interest rate (percent) 3.734% 3.734% 3.734%  
3.363% Notes due June 6, 2024        
Extinguishment of Debt [Line Items]        
Debt instrument, repurchased face amount       $ 998
Interest rate (percent)       3.363%
3.875% Notes due May 15, 2024        
Extinguishment of Debt [Line Items]        
Debt instrument, repurchased face amount       $ 144
Interest rate (percent)       3.875%