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Receivables, Loans, Notes Receivable, and Others (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Accounts and Financing Receivable, after Allowance for Credit Loss, Current and Noncurrent [Abstract] |  |  |  |  |
Accounts Receivable, Sale | $ 234 | $ 0 | $ 368 |  |
Outstanding Receivables Sold under Factoring Agreements | 234 |  | 234 |  |
Accounts receivable | 5,768 |  | 5,768 |  | $ 5,723
Less: Allowance for expected credit losses | (79) |  | (79) |  | (110)
Accounts receivable - net | 5,689 |  | 5,689 |  | $ 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 |  |  | (7) | 3 |
Write-offs charged against the allowance for expected credit losses |  |  | (20) | (32) |
Other |  |  | (4) | 4 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 79 | $ 148 | $ 79 | $ 148 |

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