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Financial Instruments - Schedule Of Derivative Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Derivative [Line Items] |  |  |
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] | Cost of Goods and Services Sold | Cost of Goods and Services Sold | Cost of Goods and Services Sold
Gain (Loss) reclassified to earnings | $ (69) | $ 89 | $ 97
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other deductions, net | Other deductions, net | Other deductions, net
Derivative Gain Loss Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed, Flag | Total | Total | Total
Gain (Loss) to other comprehensive income, Total | $ (80) | $ 290 | $ 87
Cash Flow Hedging | Commodity |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) reclassified to earnings | (19) | 12 | 33
Cash Flow Hedging | Commodity | Cost of sales | Other Comprehensive Income (Loss) |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) to other comprehensive income | 6 | (20) | 29
Cash Flow Hedging | Foreign currency |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) reclassified to earnings | (128) | 48 | 53
Cash Flow Hedging | Foreign currency | Cost of sales |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) reclassified to earnings | 65 | 31 | 8
Cash Flow Hedging | Foreign currency | Cost of sales | Other Comprehensive Income (Loss) |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) to other comprehensive income | 42 | 53 | 34
Cash Flow Hedging | Foreign currency | Sales |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) reclassified to earnings | (3) | (2) | 3
Cash Flow Hedging | Foreign currency | Sales | Other Comprehensive Income (Loss) |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) to other comprehensive income | 0 | (9) | 3
Net Investment Hedging | Foreign currency | Other Comprehensive Income (Loss) |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) to other comprehensive income | $ (128) | $ 266 | $ 21

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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