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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 12, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 3 years |  |
Settlement of AspenTech share awards |  | $ 76 | $ 0 | $ 0
Total stock compensation expense |  | 265 | 260 | $ 271
Unrecognized compensation cost related to non-vested awards granted |  | $ 247 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years |  | 1 year 2 months 12 days |  |
National Instruments |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense |  | $ 12 | 96 |
National Instruments | Corporate and other |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense |  |  | 43 |
National Instruments | Restructuring Charges |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense |  | 3 | 58 |
National Instruments | Restructuring Charges | Corporate and other |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense |  |  | $ 43 |
AspenTech |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Settlement of AspenTech share awards | $ 76 |  |  |
Total stock compensation expense |  | 35 |  |
AspenTech | Restructuring Charges |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense |  | $ 22 |  |
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 3 years |  |
Granted (in dollars per share) |  | $ 0 | $ 0 | $ 0
Percentage of options granted at the closing market price of common stock on the grant date |  | 100.00% |  |
Amount of stock option vesting per year |  | one-third |  |
Stock option expiration years from date of grant years |  | 10 years |  |
Employee Stock Option | Share-based Compensation Award, Tranche One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percent payout |  | 33.30% |  |
Employee Stock Option | Share-based Payment Arrangement, Tranche Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percent payout |  | 33.30% |  |
Employee Stock Option | Share-Based Payment Arrangement, Tranche Three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percent payout |  | 33.30% |  |
Restricted stock and restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense |  | $ 147 | $ 115 | $ 24
Performance shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense |  | $ 94 | $ 90 | $ 165
Performance shares | 2023 Performance Share Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding (in shares) |  | 919,000 |  |
Percent payout |  | 115.00% |  |
Performance shares | 2025 Performance Share Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding (in shares) |  | 477,000 |  |
Performance shares | 2024 Performance Share Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding (in shares) |  | 505,000 |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding (in shares) |  | 2,976,000 |  |
Shares vested in period (in shares) |  | 56,000 |  |
Common shares issued (in shares) |  | 33,000 |  |
Shares withheld for income taxes (in shares) |  | 23,000 |  |
Restricted Stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period in which expenses are recognized |  | 10 years |  |
Restricted Stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period in which expenses are recognized |  | 3 years |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period |  | 3 years |  |
Unvested shares outstanding (in shares) |  | 2,976,000 |  |
Shares vested in period (in shares) |  | 1,317,000 |  |
Common shares issued (in shares) |  | 1,001,000 |  |
Shares withheld for income taxes (in shares) |  | 316,000 |  |
Restricted Stock For Non Management Directors Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding (in shares) |  |  | 15,000 |
Share-based compensation arrangement by share-based payment award, number of shares available for grant |  | 25,000 |  |
Incentive Shares Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding (in shares) |  | 4,877,000 | 4,634,000 |
Shares vested in period (in shares) |  | 2,291,000 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant |  | 15,700,000 |  |

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