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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Derivatives Not Designated as Hedging Instruments |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | $ (257) | $ 93
Interest rate contracts | Derivatives designated as hedging instruments: | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | 12 | 0
Interest rate contracts | Derivatives designated as hedging instruments: | Interest expense | Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) |  |
Loss Reclassified from AOCI into Income | (6) | (7)
Foreign currency contracts | Derivatives designated as hedging instruments: | Net Investment Hedging |  |
Derivative Instruments, Gain (Loss) |  |
Foreign currency contracts | 0 | (8)
Foreign currency contracts | Derivatives Not Designated as Hedging Instruments | Other non-operating income (expense), net |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 8 | (20)
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Revenues |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 8 | 3
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Cost of sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | (273) | 103
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Operating and administrative expenses |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 0 | 2
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Other operating income, net |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | $ 0 | $ 5

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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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