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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 | 9 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | $ (18) | $ 27 | $ 148 | $ 56
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 | (3) | (2) | (7) | 2
Foreign Currency Exchange Derivatives | Selling, General And Administrative |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | (2) | 0 | (1) | 0
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 | (17) | 19 | 128 | 68
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 | 10 | 28 | (14)
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 | (2) | 5 | 12 | 4
Amount of Gain (Loss) Reclassified from AOCI into Income | 17 | (2) | 17 | 0
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 | 1 | 0 | 14 | 2
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 | 7 | (4) | 10 | (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 | 10 | 5 | 11 | 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 | 10 | 2 | 7 | 1
Cash Flow Hedging | Interest Rate Swaps |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (13) | 0 | (13) | 0
Net Investment Hedging [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gains (losses) reclassified from CTA to income for the Company's outstanding net investment hedges | 0 | 0 | 0 | 0
Pre-tax losses on net investment hedges recorded in CTA within other comprehensive income (loss) | $ (39) | $ (46) | $ (30) | $ (58)

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- Definition Cash Flow Hedge [Abstract] + References No definition available. + Details
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- Definition Gains (losses) reclassified from CTA to income for the Company's outstanding net investment hedges + 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=125515794&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=125515794&loc=SL5624171-113959 + Details
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- Definition Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CCC -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998896-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558989&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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