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Financial Instruments and Fair Value Measurements - Cash and Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Fair Value Disclosures [Abstract]        
Cash and equivalents $ 4,459 $ 1,416    
Restricted cash 28 65    
Cash and equivalents and restricted cash $ 4,487 $ 1,481 $ 1,024 $ 1,159