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Financial Instruments (Schedule Of Derivative Instruments) (Details) € in Millions, lb in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) lb | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€)
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) reclassified to earnings | $ 97 | $ (49) | $ 68 |
Other Comprehensive Income (Loss), Total | 87 | (134) | 66 |
Senior Notes [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Debt, face amount | € |  |  |  | € 1,500
Commodity [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Notional value of hedge positions | 137 |  |  |
Foreign currency [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Notional value of hedge positions | 2,000 |  |  |
Foreign currency [Member] | Other deductions, net [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) reclassified to earnings | $ 53 | (40) | 66 |
Copper and aluminum [Member] | Commodity [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Weight of copper and aluminum for commodity hedges, in pounds | lb | 39 |  |  |
Cash Flow Hedging [Member] | Commodity [Member] | Cost of sales [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) reclassified to earnings | $ 33 | (8) | (11) |
Cash Flow Hedging [Member] | Foreign currency [Member] | Cost of sales [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) reclassified to earnings | 8 | 4 | 20 |
Cash Flow Hedging [Member] | Foreign currency [Member] | Sales [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) reclassified to earnings | 3 | (5) | (7) |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Commodity [Member] | Cost of sales [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) to other comprehensive income | 29 | 10 | (10) |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Foreign currency [Member] | Cost of sales [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) to other comprehensive income | 34 | (25) | 14 |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging [Member] | Foreign currency [Member] | Sales [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) to other comprehensive income | 3 | 4 | (8) |
Other Comprehensive Income (Loss) [Member] | Net Investment Hedging [Member] | Foreign currency [Member] |  |  |  |
Financial Instruments [Line Items] |  |  |  |
Gain (Loss) to other comprehensive income | $ 21 | $ (123) | $ 70 |

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