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Equity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Stockholders' Equity Note [Abstract]        
Repurchases and retirements of ordinary shares $ 402 $ 366 $ 876 $ 613
Stock repurchase program, remaining authorized repurchase amount $ 2,100   $ 2,100