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Other Financial Data - Depreciation and Amortization Expense Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |
Depreciation expense | $ 287 | $ 312 | $ 330
Amortization of intangibles (includes $57, $108 and $196 reported in Cost of Sales in 2021, 2022 and 2023, respectively) (a) | 678 | 444 | 334
Amortization of capitalized software | 86 | 86 | 98
Total | 1,051 | 842 | 762
Amortization if intangibles reported in Cost of Sales | 196 | 108 | 57
Amortization of intangible assets | 764 | 530 | 432
Heritage AspenTech |  |  |
Business Acquisition [Line Items] |  |  |
Amortization of intangible assets | $ 397 | 148 |
Amortization of intangibles - related restructuring |  | $ 14 |
Open Systems International, Inc. | Backlog |  |  |
Business Acquisition [Line Items] |  |  |
Amortization of intangible assets |  |  | $ 30

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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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