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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 12,299 $ 16,487    
Cash, cash equivalents, restricted cash and restricted cash equivalents 16,516 19,799 $ 19,558 $ 19,171
U.S. litigation escrow        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 882 894    
Customer collateral        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: 2,309 2,260    
Prepaid expenses and other current assets        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash and restricted cash equivalents: $ 1,026 $ 158