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Receivables, Loans, Notes Receivable, and Others (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Accounts and Financing Receivable, after Allowance for Credit Loss, Current and Noncurrent [Abstract] |  |  |
Accounts Receivable, Sale | $ 129 | $ 0 |
Outstanding Receivables Sold under Factoring Agreements | 127 |  |
Accounts Receivable, before Allowance for Credit Loss, Current | 5,723 | 5,467 |
Less: Allowance for expected credit losses | (110) | (173) | [1]
Accounts receivable - net | 5,613 | 5,294 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Accounts Receivable, Allowance for Credit Loss, Beginning Balance | 173 |  |
Accounts Receivable, Credit Loss Expense (Reversal) | (3) |  |
Accounts Receivable, Allowance for Credit Loss, Writeoff | (65) |  |
Accounts Receivable, Allowance for Credit Loss, Currency translation | 1 |  |
Accounts Receivable, Allowance for Credit Loss, Other | 4 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 110 | $ 173 |
[1] | (1) Allowance for doubtful accounts as of September 30, 2020, prior to the adoption of ASU 2016-13.

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4531-111522 + Details
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- Definition Amount of decrease from sale of accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447 + Details
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