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SEC Schedule, Article 12-09, Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Deferred Tax Assets - Valuation Allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 1,655 | $ 1,662 | $ 1,637
Provision during period | 90 | (61) | 94
Allowance adjustments | 24 | 54 | (69)
SEC Schedule, 12-09, valuation allowances and reserves, amount, ending balance | 1,769 | 1,655 | 1,662
Accounts Receivable - Allowances |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 15 | 21 | 29
Provision during period | 13 | 9 | 10
Allowance adjustments | (5) | (15) | (16)
Currency translation | 1 | 0 | (2)
SEC Schedule, 12-09, valuation allowances and reserves, amount, ending balance | $ 24 | $ 15 | $ 21

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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