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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill and intangible asset impairment | $ 0 | $ 224,000,000 | $ 0 | $ 158,000,000
Impairment |  | 161,000,000 |  | 158,000,000
Goodwill |  | 3,839,000,000 | 3,993,000,000 | 3,529,000,000
Amortization of intangible assets |  | 152,000,000 | 155,000,000 | 116,000,000
Estimated amortization expense in 2026 |  | 131,000,000 |  |
Estimated amortization expense in 2027 |  | 122,000,000 |  |
Estimated amortization expense in 2028 |  | 111,000,000 |  |
Estimated amortization expense in 2029 |  | 73,000,000 |  |
Estimated amortization expense in 2030 |  | $ 71,000,000 |  |
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Goodwill and intangible asset impairment |  |
Intangible assets, net (excluding goodwill) |  | $ 864,000,000 | 1,066,000,000 |
Impairment of assets |  | $ 63,000,000 |  |
Impairment Of Intangible Asset Finite Lived Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag |  | pre-tax, non-cash intangible asset impairment charge |  |
Software products |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets |  | $ 11,000,000 | 12,000,000 | 11,000,000
Sensia |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Reporting unit, carrying value |  |  |  | $ 665,000,000
Impairment |  | 161,000,000 |  |
Goodwill |  |  | $ 161,000,000 |
Intangible assets, net (excluding goodwill) |  | 58,000,000 |  |
Finite-Lived Intangible Assets, Fair Value Disclosure |  | $ 58,000,000 |  |

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