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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 | 6 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | $ 35 | $ (12) | $ 27 | $ (6)
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 | (2) | (3) | (6) | (1)
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 | (3) | 0 | (24) | 3
Foreign Currency Exchange Derivatives | Discontinued Operations |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | 28 | (4) | 54 | (1)
Equity swap | Selling, General And Administrative |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | 12 | (5) | 3 | (7)
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 | 50 | (100) | 84 | (136)
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 | 18 | (6) | 12 | 3
Amount of Gain (Loss) Reclassified from AOCI into Income | (4) | 2 | (10) | 9
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 | (5) | 9 | 1
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 | 2 | (3) | 2 | (1)
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 | (1) | 1 | 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 | 9 | (1) | 3 | 2
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) | 1 | (3) | 3
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 | $ (4) | $ 3 | $ (9) | $ 6

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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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