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Derivative Instruments and Hedging Activities - Location and Amount of Gains and Losses on Derivative Instruments and Related Hedge Items (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivative | $ (153) | $ (48)
Foreign currency exchange derivatives | Cost of sales |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivative | (7) | (5)
Foreign currency exchange derivatives | Net financing charges |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivative | (144) | (43)
Foreign currency exchange derivatives | Selling, general and administrative |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized in income on derivative | (2) | 0
Cash Flow Hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 14 | (47)
Amount of gain (loss) reclassified from AOCI into income | 1 | (4)
Cash Flow Hedging | Foreign currency exchange derivatives |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 17 | (13)
Cash Flow Hedging | Foreign currency exchange derivatives | Cost of sales |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from AOCI into income | 1 | (1)
Cash Flow Hedging | Commodity derivatives |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | (3) | 1
Cash Flow Hedging | Commodity derivatives | Cost of sales |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) reclassified from AOCI into income | 0 | (3)
Cash Flow Hedging | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 0 | (35)
Net Investment Hedging |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income | $ 238 | $ 145

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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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