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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 13,842 $ 15,689    
Cash, cash equivalents, restricted cash and restricted cash equivalents 19,128 20,377 $ 16,516 $ 19,799
U.S. litigation escrow        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 1,616 1,449    
Customer collateral        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 2,739 2,342    
Prepaid expenses and other current assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: $ 931 $ 897