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Financial Instruments - Narrative (Details) $ / shares in Units, $ in Millions, € in Billions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Apr. 12, 2023 $ / shares | Sep. 30, 2019 EUR (€)
Derivative [Line Items] |  |  |  |
Mark-to-market gain | $ 24 | $ (50) |  |
Fair value of notes receivable compared with carrying value, higher (lower) | (200) |  |  |
National Instruments |  |  |  |
Derivative [Line Items] |  |  |  |
Business acquisition, purchase price per share (in dollars per share) | $ / shares |  |  | $ 60 |
National Instruments |  |  |  |
Derivative [Line Items] |  |  |  |
Investments | 136 |  |  |
Mark-to-market gain | 56 |  |  |
Level 2 |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value of notes receivable | 1,900 |  |  |
Fair value of long-term debt | 6,900 | 7,600 |  |
Fair value of long term debt compared with carrying value, higher (lower) | (1,275) | $ 1,207 |  |
Senior Notes |  |  |  |
Derivative [Line Items] |  |  |  |
Debt, face amount | € |  |  |  | € 1.5
Foreign currency |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value of hedge positions | $ 2,400 |  |  |

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