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Valuation and Qualifying Accounts Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Accounts Receivable - Allowance for Doubtful Accounts |  |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | $ 173 | [1] | $ 173 | [1] | $ 169 |
Provision (income) charged to costs and expenses | (3) |  | 20 |  | 37 |
Accounts charged off, net of recoveries | (65) |  | (21) |  | (21) |
Acquisition (divestiture) of businesses | 0 |  | 0 |  | (10) |
Currency translation | 1 |  | 1 |  | (2) |
Other (including impact of adoption of ASU 2016-13) | 4 |  | 0 |  | 0 |
Balance at end of period | 110 |  | 173 | [1] | 173 | [1]
Deferred Tax Assets - Valuation Allowance |  |  |  |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 5,518 |  | 5,068 |  | 5,088 |
Allowance provision for new operating and other loss carryforwards | 505 |  | 624 |  | 195 |
Allowance provision (benefits) | (170) |  | (174) |  | (215) |
Balance at end of period | $ 5,853 |  | $ 5,518 |  | $ 5,068 |
[1] | (1) Allowance for doubtful accounts as of September 30, 2020 and 2019, prior to the adoption of ASU 2016-13.

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