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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents - Schedule of Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 12,367 $ 11,975    
Cash, cash equivalents, restricted cash and restricted cash equivalents 19,966 19,763 $ 19,636 $ 21,990
U.S. litigation escrow        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 3,112 3,089    
Customer collateral        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 3,518 3,524    
Prepaid expenses and other current assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: $ 969 $ 1,175