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Derivative Instruments and Hedging Activities - Derivatives Gains and Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) on derivatives | $ 3,000,000 | $ (12,000,000) | $ (13,000,000) | $ (18,000,000)
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 | (1,000,000) | 1,000,000 | (1,000,000) | (1,000,000)
Foreign currency exchange derivatives | Selling, general and administrative |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) on equity swap derivatives not designated as hedging instrument | 4,000,000 | (12,000,000) | (13,000,000) | (15,000,000)
Foreign currency exchange derivatives | Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gains (losses) | 3,000,000 | 15,000,000 | (1,000,000) | 8,000,000
Ineffective portion of gain (loss) recognized in income | 0 | 0 | 0 | 0
Foreign currency exchange derivatives | Cash Flow Hedging | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Effective portion of pretax gain (loss) reclassified from AOCI into income | (2,000,000) | 1,000,000 | (2,000,000) | 2,000,000
Foreign currency exchange derivatives | Net Investment Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Effective portion of pretax gains (loss) related to net investment hedges | 22,000,000 | (37,000,000) | 44,000,000 | (54,000,000)
Gains (losses) reclassified into income for net investment hedges | 0 | 0 | 0 | 0
Equity swaps | Net financing charges |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) on foreign currency exchange derivatives not designated as hedging instrument | $ 0 | $ (1,000,000) | $ 1,000,000 | $ (2,000,000)

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- Definition Amount of gain from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109974929&loc=SL110061172-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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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=109980867&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=109980867&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=109974929&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=109980867&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=109980867&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=114867106&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=114867106&loc=SL7669646-108580 + Details
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