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Receivables, Loans, Notes Receivable, and Others (Tables) | 3 Months Ended
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Dec. 31, 2021
Receivables [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable | Accounts receivable, net consisted of the following (in millions):
|  | December 31, 2021 |  | September 30, 2021 |  |
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 | The changes in the allowance for expected credit losses related to accounts receivable for the three months ended December 31, 2021 and 2020 were as follows (in millions):
| Three Months Ended December 31, |  |
| 2021 |  | 2020 |  |
Balance at beginning of period | $ | 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 |  |  |
Balance at end of period | $ | 91 |  |  | $ | 173 |  |  |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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