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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, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | $ (12) | $ 7 | $ (6) | $ 14
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 | (4) | 2 | (2) | 3
Foreign Currency Exchange Derivatives | Discontinued Operations [Domain] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | 0 | 0 | 0 | 5
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) | 5 | 1 | 9
Foreign Currency Exchange Derivatives | Provision For Income Tax [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | 0 | 0 | 2 | (3)
Equity swap | Selling, General And Administrative |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | (5) | 0 | (7) | 0
Net Investment Hedging [Member] |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (100) | (19) | (136) | 28
Cash Flow Hedging |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (6) | 1 | 3 | 11
Amount of Gain (Loss) Reclassified from AOCI into Income | 2 | 11 | 9 | 20
Cash Flow Hedging | Foreign Currency Exchange Derivatives |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (5) | (2) | 1 | 6
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) | 8 | 0 | 16
Cash Flow Hedging | Commodity Derivatives |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | (1) | 3 | 2 | 5
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 | 4 | 3 | 9 | 4
Fair Value Hedging |  |  |  |
Fair Value Hedge [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Fair Value Hedge | 0 | 0 | 0 | 1
Fair Value Hedging | Interest Rate Swaps | Net Financing Charges |  |  |  |
Fair Value Hedge [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Fair Value Hedge | 0 | 0 | 0 | (1)
Fair Value Hedging | Fixed Rate Debt Swapped to Floating | Net Financing Charges |  |  |  |
Fair Value Hedge [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Fair Value Hedge | $ 0 | $ 0 | $ 0 | $ 2

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- Definition Cash Flow Hedge [Abstract] + References No definition available. + Details
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- Definition Fair Value Hedge [Abstract] + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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