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Supplemental Financial Information - Trade Receivables, Allowances for Doubtful Accounts and Cash Discounts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning Balance | $ 81 | $ 91 | $ 88
Additions charged to costs and expenses | 109 | 77 | 101
Deductions and other | (110) | (87) | (97)
Ending Balance | 81 | 81 | 91
Allowance for Doubtful Accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning Balance | 65 | 73 | 76
Additions charged to costs and expenses | 9 | 4 | 17
Deductions and other | (10) | (12) | (20)
Ending Balance | 65 | 65 | 73
Allowance for Cash Discounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning Balance | 16 | 18 | 12
Additions charged to costs and expenses | 100 | 73 | 84
Deductions and other | (100) | (75) | (77)
Ending Balance | $ 16 | $ 16 | $ 18

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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