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Derivative Instruments and Hedging Activities - Location and Amount of Gains and Losses on Derivative Instruments and Related Hedge Items (Detail) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | $ 55 | $ (8)
Foreign Currency Exchange Derivatives | Cost of Sales |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | 0 | (4)
Foreign Currency Exchange Derivatives | Net Financing Charges |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | 59 | (21)
Foreign Currency Exchange Derivatives | Discontinued Operations |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | 0 | 26
Equity swap | Selling, General And Administrative |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | (4) | (9)
Net Investment Hedging [Member] |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (58) | 34
Cash Flow Hedging |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 10 | (6)
Amount of Gain (Loss) Reclassified from AOCI into Income | 0 | (6)
Cash Flow Hedging | Foreign Currency Exchange Derivatives |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 9 | 0
Cash Flow Hedging | Foreign Currency Exchange Derivatives | Cost of Sales |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | 1 | 0
Cash Flow Hedging | Foreign Currency Exchange Derivatives | Discontinued Operations |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | 0 | 1
Cash Flow Hedging | Commodity Derivatives |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 1 | (6)
Cash Flow Hedging | Commodity Derivatives | Cost of Sales |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | (1) | (2)
Cash Flow Hedging | Commodity Derivatives | Discontinued Operations |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | $ 0 | $ (5)

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- Definition Cash Flow Hedge [Abstract] + References No definition available. + 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 The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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