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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Gain (Loss) Recognized in Income, Derivative not Recognized as Hedge | $ (19) | $ (18) | $ 75 | $ 148
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 | 1 | (3) | 8 | (7)
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 | 0 | (2) | 0 | (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 | (16) | (17) | 72 | 128
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) | 4 | (5) | 28
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 | (21) | (2) | 6 | 12
Amount of Gain (Loss) Reclassified from AOCI into Income | 9 | 17 | 14 | 17
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 | 3 | 1 | 26 | 14
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 | 14 | 7 | 25 | 10
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 | (24) | 10 | (20) | 11
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) | 10 | (9) | 7
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 | 0 | (13) | 0 | (13)
Cash Flow Hedging | Interest Rate Swaps | Net Financing Charges |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract] |  |  |  |
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | (1) | 0 | (2) | 0
Net Investment Hedging [Member] |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments [Abstract] |  |  |  |
Pre-tax gains (losses) on net investment hedges recorded in CTA within other comprehensive income (loss) | 192 | (39) | 315 | (30)
Gains (losses) reclassified from CTA to income for the Company's outstanding net investment hedges | $ 0 | $ 0 | $ 0 | $ 0

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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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