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Consolidated Statements of Financial Position (Parenthetical)
$ in Millions
Mar. 31, 2024
USD ($)
$ / shares
Mar. 31, 2024
€ / shares
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2023
€ / shares
Accounts receivable, allowance for credit loss, current | $ $ 118   $ 90  
Ordinary shares, par value (in dollars per share) $ 0.01   $ 0.01  
Preferred shares, par value (in dollars per share) $ 0.01   $ 0.01  
Common Class A        
Ordinary shares, par value (in dollars per share) | € / shares   € 1.00   € 1.00