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Receivables, Loans, Notes Receivable, and Others (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020
Accounts and Financing Receivable, after Allowance for Credit Loss, Current and Noncurrent [Abstract] |  |
Accounts receivable | $ 5,798 | $ 5,467
Less: Allowance for expected credit losses | (130) | (173)
Accounts receivable - net | 5,668 | $ 5,294
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Accounts Receivable, Allowance for Credit Loss, Beginning Balance | 173 |
Write-offs charged against the allowance for expected credit losses | (50) |
Other (including impact of adoption of ASU 2016-13) | 7 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 130 |

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