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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | $ (3) | $ (10) | $ (26)
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 | (4) | (2) | 4
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 | 1 | 5 | (5)
Foreign currency exchange derivatives | Cash flow hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Cash flow hedges on foreign currency exchange derivatives | (37) | (5) | (9)
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 | (16) | (4) | (3)
Equity swaps | Selling, general and administrative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gain (loss) on equity swap derivatives not designated as hedging instrument | $ 0 | $ (13) | $ (25)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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