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BUSINESS SEGMENTS - Depreciation & Amortization (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | $ 384 | $ 424 | $ 767 | $ 846
National Instruments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Amortization of intangible assets |  | 34 |  | 68
Operating Segments | Intelligent Devices |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 108 | 108 | 215 | 224
Operating Segments | Software and Control |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 265 | 305 | 530 | 600
Operating Segments | Final Control | Intelligent Devices |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 41 | 39 | 81 | 79
Operating Segments | Measurement & Analytical | Intelligent Devices |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 31 | 33 | 62 | 73
Operating Segments | Discrete Automation | Intelligent Devices |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 22 | 21 | 43 | 43
Operating Segments | Safety & Productivity | Intelligent Devices |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 14 | 15 | 29 | 29
Operating Segments | Control Systems & Software | Software and Control |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 146 | 152 | 293 | 296
Operating Segments | Test & Measurement | Software and Control |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 119 | 153 | 237 | 304
Corporate and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | $ 11 | $ 11 | $ 22 | $ 22

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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