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Derivative Instruments and Hedging Activities - Derivatives Gains and Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | $ 14 | $ (2) | $ (33)
Foreign currency exchange derivatives | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gain (loss) on foreign currency exchange derivatives not designated as hedging instrument | (8) | 8 | 0
Foreign currency exchange derivatives | Net financing charges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gain (loss) on foreign currency exchange derivatives not designated as hedging instrument | 22 | (10) | (33)
Foreign currency exchange derivatives | Cash flow hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedges on foreign currency exchange derivatives | (2) | 89 | 8
Foreign currency exchange derivatives | Cash flow hedging | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedges on foreign currency exchange derivatives, reclassified from AOCI | 46 | 66 | 6
Foreign currency exchange derivatives | Cash flow hedging | Net financing charges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedges on foreign currency exchange derivatives, reclassified from AOCI | $ 1 | $ 0 | $ 0

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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480627/815-20-45-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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