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Payments to Settle Awards

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued under share-based payment arrangement.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of award under share-based payment arrangement.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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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