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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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 |  |
Total stock compensation expense | $ 260 | $ 271 | $ 144
Restructuring costs | 228 | 72 | 75
Unrecognized compensation cost related to non-vested awards granted | $ 190 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 1 year 1 month 6 days |  |
Common stock, capital shares reserved for future issuance (in shares) | 23,300,000 |  |
Corporate and other |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restructuring costs | $ 51 | $ 14 | $ 13
National Instruments |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock compensation expense | 96 |  |
National Instruments | Corporate and other |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restructuring costs | 43 |  |
National Instruments | Restructuring Charges |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock compensation expense | $ 58 |  |
AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, capital shares reserved for future issuance (in shares) | 4,000,000 |  |
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 |  |
Intrinsic value of options exercised | $ 15 | $ 27 | $ 11
Cash received for option exercises | $ 14 | 49 | 15
Employee Stock Option | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 4 years |  |
Unrecognized compensation cost related to non-vested awards granted | $ 8 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 2 years 2 months |  |
Granted (in dollars per share) | $ 0 |  |
Expected dividend yield | 0.00% |  |
Intrinsic value of options exercised | $ 15 |  |
Cash received for option exercises | $ 25 |  |
Employee Stock Option | AspenTech | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, expiration period | 10 years |  |
Employee Stock Option | AspenTech | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, expiration period | 7 years |  |
Restricted stock and restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock compensation expense | $ 115 | 24 | 23
Restricted stock and restricted stock units | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost related to non-vested awards granted | $ 63 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 2 years 2 months 12 days |  |
Performance shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock compensation expense | $ 90 | $ 165 | 89
Performance shares | 2022 Performance Share Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 919,000 |  |
Percent payout | 118.00% |  |
Performance shares | 2024 Performance Share Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 518,000 |  |
Performance shares | 2023 Performance Share Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 928,000 |  |
Performance shares | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost related to non-vested awards granted | $ 23 |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 2 years 7 months 6 days |  |
Performance period in which expenses are recognized | 3 years |  |
Performance shares | AspenTech | Share-based Payment Arrangement, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent payout | 150.00% | 175.00% |
Performance shares | AspenTech | Share-based Compensation Award, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent payout |  | 25.00% |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 2,269,000 |  |
Shares vested in period (in shares) | 55,000 |  |
Common shares issued (in shares) | 38,000 |  |
Shares withheld for income taxes (in shares) | 17,000 |  |
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) | 2,269,000 |  |
Shares vested in period (in shares) | 1,462,000 |  |
Common shares issued (in shares) | 1,404,000 |  |
Shares withheld for income taxes (in shares) | 58,000 |  |
Restricted Stock Units (RSUs) | AspenTech |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total fair value of shares earned/vested (in shares) | $ 62 |  |
Payment, tax withholding, share-based payment arrangement | $ 21 |  |
Restricted Stock For Non Management Directors Member |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 19,000 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 38,000 |  |
Incentive Shares Member |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding (in shares) | 4,634,000 | 4,437,000 |
Shares vested in period (in shares) | 2,986,000 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 17,500,000 |  |
Total fair value of shares earned/vested (in shares) | $ 284 | $ 158 | $ 158

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