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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 16,286 $ 15,689    
Cash, cash equivalents, restricted cash and restricted cash equivalents 21,990 20,377 $ 19,799 $ 19,171
U.S. litigation escrow        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 1,764 1,449    
Customer collateral        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 3,005 2,342    
Prepaid expenses and other current assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: $ 935 $ 897