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Receivables, Loans, Notes Receivable, and Others (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Accounts and Financing Receivable, after Allowance for Credit Loss, Current and Noncurrent [Abstract]      
Accounts Receivable, Sale $ 134 $ 0  
Outstanding Receivables Sold under Factoring Agreements 135    
Accounts receivable 5,762   $ 5,723
Less: Allowance for expected credit losses (91)   (110)
Accounts receivable - net 5,671   $ 5,613
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Accounts Receivable, Allowance for Credit Loss, Beginning Balance 110 173  
Provision (benefit) for expected credit losses (6) 7  
Write-offs charged against the allowance for expected credit losses (14) (12)  
Other 1 5  
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 91 $ 173